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Free University amsterdam

TIME-SLICE ORIENTED MULTI-PROXY DATABASE (MPDB) FOR PALAEOCLIMATE RECONSTRUCTION

René Isarin, Bert Huijzer & Ko van Huissteden

Instituut voor Aardwetenschappen, Vakgroep Hydrologie, Kwartairgeologie en Laaglandgenese, Vrije Universiteit, De Boelelaan 1085, 1081 HV Amsterdam

Tel. +31 20 4447357/4447354

Fax. +31 20 6462457

Email: isar@geo.vu.nl, huik@geo.vu.nl

1. INTRODUCTION

Earth science literature abounds in descriptions of periglacial features that can be used for interpretation of palaeoenvironments. A single site description usually does not allow more than an interpretation of local environmental or palaeoclimatic conditions. However, if a large number of sites is taken into consideration, a synopsis of regional environmental conditions may emerge (Van Huissteden, 1990; Lowe et al., 1994; Huijzer & Isarin, 1997; Isarin, 1997a,b). Of course, inspecting a large amount of literature, some of which may be difficult to access, requires a considerable effort that may severely hinder the creation of such an overview.

With this database it is attempted to summarize the data from a large number of sites in northwestern Europe. The area covered by this database stretches in a west-east direction from Ireland to Poland (9° W to 23° E), and in a south-north direction from Norway to France (48° N to 59° N). The time span covered is that of the last glacial, with special attention to the part of the last glacial that falls within the limits of the radiocarbon dating method.

The data have been gathered as part of the EPECC project (Huijzer & Isarin, 1997) and the thesis research of Isarin (1997) and Renssen (1997). The database has proven to be an ideal tool for palaeoclimate reconstructions and comparison with climate model experiments.

Besides periglacial phenomena, the database also includes data on palaeosols, fluvial and aeolian deposits, botanical and faunal data. The database published here is abstracted from this larger data set, and includes only the periglacial features, palaeosols and depositional environment data.

Most of the data is derived from publications in scientific periodicals or books. Some of these may be more difficult to access for users outside the European continent. Also data from thesis research has been included. Only in a few cases data from unpublished reports have been included. The oldest publication dates from 1952. Updating of the database has continued up to 1996. Updating with newer literature will continue within short, and a newer version may be available in 1998.

Data quality management is an important topic when data are summarized from a large number of publications. Each site description contains a description of its source, allowing a check on the quality of the site. The publications themselves differ widely in the completeness of the description, and dating of the observed palaeoperiglacial phenomena. In the database we have included as much factual information on the described phenomena as possible. This allows the user to define her/his own quality standard by putting demands on the presence of certain descriptive elements of the data.

The tables are available as dBASE and ASCII text files. The latter format requires import in database software and establishment of the relations between the tables as described in the next paragraph. This format is easily annexed to GIS systems for production of palaeoclimatic maps.

2. STRUCTURE OF THE DATABASE

The database has a relational structure and consists of indexed dBASE files. These easily can be linked in queries, for example with the dBASE V or Visual dBASE user interface. A separate user interface for this dBASE version has not been developed, for most purposes the use of the dBASE user interface will be sufficient.

Please cite these data as follows:

Vandenberghe, J., R. Isarin, B. Huijzer, and K. van Huissteden. 1998. Paleo-periglacial phenomena in northwestern Europe. In: International Permafrost Association, Data and Information Working Group, comp. Circumpolar Active-Layer Permafrost System (CAPS), version 1.0. CD-ROM available from National Snow and Ice Data Center, nsidc@kryos.colorado.edu. Boulder, Colorado: NSIDC, University of Colorado at Boulder.

Figure 1. Layout of the database. A 1:1 relation indicates that a record in the first table is related to just one record in the second table. A 1:n (one to many) relation indicates that one record in the first table is is related to more records in the table where the arrow is pointing to.

Figure 1 summarizes the structure of the database and the links between the tables. The table PROXY is the central table of the database, linking the actual description of observed phenomena, the age information and site description. The observed phenomena are stored in four tables (PERIGLAC, PEDOLOGI, AEOLIAN, FLUVIAL), according to the nature of the phenomena. The chronological information is stored in a seperate table, AGE. The site information contains two tables, GENSITE and SUBSCRIP. These contain general site information (e.g. location, topography) and bibliographical information respectively. Below, an extensive description of the tables and their contents is given.

3. SITE INFORMATION

The tables GENSITE and SUBSCRIP contain information on the sites described in the other tables, and information on the data source respectively. These tables are linked by the field SITE-ID, that contains a unique site number.

3.1. Table GENSITE

The table 'GENeral SITE information' includes information on the site. General information items consists of the name of the site, country, province/state, county etc., X (latitude), Y (longitude), and Z (altitude) coordinates, and a short description of the site, including the present state and the period of the latest glaciation.

Table 3.1. Field description of database table GENSITE.


Field name Field type Field length Deci-mals Description / Example
SITE-ID Character 6   Unique site number e.g. S92354
SITENAME Character 25   Site name e.g. Liastemmen
COMMENTS Memo 10   Text with comments
COUNTRY Character 3   Abbreviated country name, e.g. Nor = Norway
MAJORDIV Character 25   Major political division (province names etc) or region, e.g. southern Norway
MINORDIV Character 25   Minor Political Division e.g. Rogaland
LONGITUDE  Numeric 10 4 Geographic longitude (degrees), numbers behind decimal point indicate minutes and seconds
LONGIDEC Numeric 10 4 Geographic longitude (degrees), with decimal subdivision
LATITUDE Numeric 10 4 Geographic latitude (degrees), numbers behind decimal point indicate minutes and seconds
LATITUDE Numeric 10 4 Geographic latitude (degrees), with decimal subdivision
ALTITUDE Character 7   Altitude, in meters
PHYSIOGRAP Character 45   Physiographic description of site e.g. River terrace of the Rhine
SITE_TYPE Character 50   Characteristics of site, e.g. sandpit
LASTGLAC Character 1   Indication of the last glaciation that occurred on the site, W=Weichselian, S=Saalian, E=Elsterian, N=Non-glaciated (name of glacial according to the northwest European terminology)

3.2. Table SUBSCRIP

In the table 'SUBSCRIPtion', general information on the name of the subscriber, date, project, period selected for data entry, and publications can be recorded. Publications (and/or unpublished reports) are inscribed as far as they present relevant (palaeoclimate) information related to the involved site. If necessary, this table may be extended for more than four publications.

Table 3.2. Field description of database table SUBSCRIP.


Field name Field type Field length Deci-mals Description / Example
SITE-ID Character 6   Unique site number e.g. S92354
DATE Date 8   Date of inscription, mm/dd/yy, e.g. 06011994
NAME Character 20   Name of the present subscriber, e.g. Bundy, Al
PROJECT  Character 10   Name (or acronym) of the project to which the entry of data is related, e.g. EPECC 
AUTHORS1 Character 40   Authors of publication related to subscription, e.g. Mol, J.A.M. et al.
YEAR1  Numeric 4 0 Year of publication, e.g. 1993
JOURNAL1 Character 40   Journal of publication, e.g. JQS 12, 123-145
AUTHORS2 Character 40   See AUTHORS1
YEAR2 Numeric 4 0 See YEAR1
JOURNAL2 Character 40   See JOURNAL1
AUTHORS3 Character 40   See AUTHORS1
YEAR3 Numeric 4 0 See YEAR1
JOURNAL3 Character 40   See JOURNAL1
AUTHORS4 Character 40   See AUTHORS1
YEAR4 Numeric 4 0 See YEAR1
JOURNAL4 Character 40   See JOURNAL1
AUTHORS5 Character 40   See AUTHORS1
YEAR5 Numeric 4 0 See YEAR1
JOURNAL5 Character 40   See JOURNAL1
AUTHORS6 Character 40   See AUTHORS1
YEAR6 Numeric 4 0 See YEAR1
JOURNAL6 Character 40   See JOURNAL1
AUTHORS7 Character 40   See AUTHORS1
YEAR7 Numeric 4 0 See YEAR1
JOURNAL7 Character 40   See JOURNAL1
AUTHORS8 Character 40   See AUTHORS1
YEAR8 Numeric 4 0 See YEAR1
JOURNAL8 Character 40   See JOURNAL1

4. PALAEO-PERIGLACIAL INFORMATION RECORDS

Information on palaeo-periglacial environments is stored according to the type of event and sedimentary environment in separate tables. Included in the database are tables referring to periglacial features, palaeosols, and fluvial and aeolian depositional environments. The age information on the events and their palaeoclimatic interpretation is stored in a seperate table, to be discussed in the next chapters.

Examples of periglacial features are sedimentary structures such as ice-wedge casts and cryoturbatic involutions, or periglacial landforms such as pingo or palsa remnants. The palaeosol table features information on soil type and stratigraphy. The table of fluvial events contains information on aggradation or downcutting, fluvial facies and sedimentary structures. The table of aeolian events includes landform and sedimentary facies.

The events are labelled by unique (identifiers), which consist of two capitals (indicating the type of event), followed by (maximal) 5 digits, e.g. the aeolian event AE2664, the fluvial event FL1008, or the periglacial feature PE1023.

4.1 Events recorded as features and phenomena

4.1.1. Table PERIGLAC

Periglacial events are described in the table periglacial. In the case that a number of interrelated periglacial events occur in the same stratigraphic position, the periglacial event with the most prominent palaeoclimatic information is primarily described. For example, if an ice-wedge cast is related to a large-scale periglacial involution level, the ice-wedge cast is described as the main feature, and the involutions are reported as interrelated cryogenic features in the same database record.

Table 4.1. Field description of database table PERIGLAC.


Field name Field type Field length Deci-mals Description / Example
PERIGL_ID Character 7   Unique event number, e.g. PE1548
EVENT Character 10   Abbreviated event type, description see par. 2.1.1.1.
DATED_BY Character 50   Type of age information, description see par. 2.1.1.2.
GEOMORPH Character 1   The palaeogeomorphological position of the periglacial feature: Upland, Hillslope, Lowland or Bottomland, Channel, Other.
SEDENV Character 4   The type of sedimentary environment in which the periglacial evidence is found: Aeolian sand/silt, Glacial, Fluvial, Lacustrine, Cave
LITHO_UP Character 1   Lithological composition of the sediment body in which the feature is found: Fine-grained or Coarse-grained, Heterolithic
LITHO_LOW Character 1   See LITHO_UP
REL_CRYO Character 20   Type of interrelated cryogenic features, e.g. ice-wedge cast, Type 2a involution
TRUNCFEAT Character 1   Truncated periglacial macrostructure, e.g. truncated ice-wedge casts (Y/N)
WCDEVELOP Character 1   Time of development of the feature with respect to sedimentation surface: Syngenetic or Epigentic
WCVERTSIZE Numeric 6 2 Maximum vertical size of wedges/cracks (in meters)
WCWIDTH Numeric 6 2 Maximum width at the top of wedges/cracks (in meters)
WCPOLYGSIZ Numeric 6 2 Size of the thermal contraction polygons (in meters)
WCRELPROC Character 1   The evidence that thermal contraction cracking is the process by which a wedge or crack is formed: No, Desiccation, Cryo-desiccation.
AMPLITUDE Numeric 6 2 Amplitude of the periglacial involution (in meters)
PINGODIAM Numeric 6 0 Maximum diameter of the pingo, palsa, earth hummock, or thufur (in meters)
PINGODEPTH Numeric 6 2 Maximum depth of pingo or palsa remnant (in meters)
PINGRAMPAR Character 1   Presence of a rampart around the pingo scar? (Y/N)
PALSCOMPOS Character 1   Composition of palsa: Mineral or Organic
CRYOPLGRAD Numeric 2 0 Gradient of the cryoplanation terrace (in °)
CRYOPLEXT Numeric 6 2 Extent of the cryoplanation terrace (in square kilometers) 
MWGRAD Numeric 2 0 Gradient of the palaeotopography on which a mass-wasted deposit occurs (in °)
MWSTRUCT Character 2   The internal sedimentary structure of mass-wasted sediment is: Lobate, Stratified, Massive, Other 
CRYMITHICK Numeric 6 0 Thickness (size) of the (individual) cryogenic microfabric aggregate (in m m)

4.1.1.1. Contents of field EVENT.

The different types of periglacial events recorded in the database are subdiveded in thermal contraction cracking, periglacial involutions, cryogenic macrofabrics, perennial frost mounds, cryoplanation and mass wasting features (French, 1996; Harris et al., 1988). The descriptive names of the features are abbreviated as follows.

Thermal contraction cracking:

Ice-wedge cast, Sand-wedge cast, Composite-wedge cast, Active layer soil wedge with primary infilling, Seasonally frozen ground soil wedge with primary infilling, Active layer soil wedge with secondary infilling, Seasonally frozen ground soil wedge with secondary infilling, Vertical platy microstructures (Mol et al., 1993).

A composite wedge cast is a wedge showing evidence of both primary and secondary infilling. Soil wedges differ from the sand and ice wedges that they do not occur in perennial frozen ground, i.e. either in seasonally frozen ground or in active layers (on permafrost). Discrimination between a soil wedge and a (permafrost) sand wedge may be problematic. For a soil wedge with secondary infilling, the soil wedge corresponds to the primordial soil wedge, ice vein, or sag vein.

Periglacial involution:

These are classified according to Vandenberghe (1988, 1992). Type 1, 2a, 2b , 3a, 3b, 4a, 4b, 5a, 5b, 5c, or 6.

Type 1: individual folds of small amplitude, large wavelength.

Type 2: relatively regular, symmetrical and intensely convoluted forms arranged in closely spaced series and polygonal patterns over large areas (amplitude generally between 0.6 and 2.0 m) either down sinking (Type 2a) or updoming (Type 2b).

Type 3: same configuration as Type 2, but distinctly smaller dimensions ranging from cm to ca. 0.5 m either downsinking (Type 3a) or updoming (Type 3b).

Type 4: solitary forms of variable amplitude in drops (Type 4a) or diapirs (Type 4b).

Type 5: upward directed platy 'dykes' in a solitary form (Type 5a), in polygons (Type 5b) or the centres of the polygons may be updomed at the top and depressed at the base (Type 5c).

Type 6: other irregular structures.

Cryogenic microfabrics:
Banded fabrics, Lenticular platy microstructures, Other cryogenic microfabrics, Structural sequence with a gradual increase of thickness of lenticular platy microstructure, Structural sequence with a microstructural unconformity.

Perennial and seasonal frost mounds:

Open-system pingo, Closed-system pingo, Palsa, Earth hummock, Thufur.

A frostmound is a mound-shaped landform produced by ground-freezing combined with groundwater movement or the migration of soil moisture. A thufur is a perennial hummock formed either in the active layer in discontinuous permafrost zone or seasonally frozen grounds during ground freezing (a type of nonsorted circle). An earth hummock is a hummock having a core of silty and clayey mineral soil and showing evidence of cryoturbation. It is a type of non-sorted circle, commonly found in the continuous permafrost zone.

Cryoplanation and mass-wasting:

Cryoplanation terrace, Frost creep, Gelifluction, Grèze litées.
4.1.1.2. Contents of field DATED_BY.

This field describes the technique by which the periglacial feature is dated. Reference may be made to physical dating techniques (e.g. radiocarbon, thermoluminescence dating) or dating by stratigraphical correlation (abbreviated by ?strat? or ?s?). In the latter case reference may be made to locally known stratigraphical horizons, e.g. BGB = ?Beuningen Gravel Bed? (Van der Hammen & Wijmstra, 1971).


4.1.1.3. Palaeoclimatic information.

The periglacial events may be crudely related to palaeoclimatic information by means of a comparison with data from the modern periglacial zone (Karte, 1979, 1983; Huijzer, 1993; French, 1996; Huijzer & Isarin, 1997). However, the actual interpretation of cryogenic structures/phenomena should be based on multi-proxy data analysis, including for instance palaeobotanical data. The relation between specific periglacial features/phenomena and the palaeoclimate significance is listed in table 1.0 (cf. reference list).

The Tjuly i.e. mean air temperature of the warmest month may be inferred from the palaeobotanical record (e.g. by climatic indicator species); in most cases the derived Tjuly points to a minimum temperature. Tan i.e. a maximum mean annual air temperature may be inferred from the presence of ice-wedge casts (or thermal contraction cracks, e.g. -5°C). By means of setting the Tjuly at a specific (approximate) value e.g. 10°C and the maximum mean annual air temperature (Tan), the Tjan i.e. mean air temperature of the coldest month, may be calculated if a symmetric annual amplitude is assumed. The calculated mean annual temperature for Tjan represents a maximum temperature; in this example the calculated Tjan approximates -20°C (cf. Vandenberghe and Pissart, 1993).

The classification and interpretation of periglacial involutions follows that of Vandenberghe (1988). Involution type 1, 5 and 6 are attributed to cryostatic pressure (volumetric expansion of freezing water or frost heave) or cryohydrostatic pressure (pressure exerted by water between freezing fronts cf. Washburn, 1979) in seasonally frozen ground or permafrost. Involution type 2, 3 and 4 result from periglacial loading. In this case, sediments may sink down under gravitational force in the underlying sediments, while the lower material may rise in the upper deposits. Essential conditions are a reversed density gradient and liquefaction caused by overpressure of water in a water-saturated topsoil. Type 4b also may result of cryohydrostatic pressure.

Table 4.2. Palaeoclimatic interpretation of periglacial features. MAAT = mean annual air temperature, MAP = mean annual precipitation.


Event Palaeoclimate information
Thermal contraction cracking  
Ice-wedge cast (Iw) coarse-grained substrate MAAT < -8°; fine-grained substrate MAAT < -4°C; MAP > 50-500 mm
Sand-wedge cast (Sw) MAAT < -12°C to < -20°C; MAP < 100 mm
Composite-wedge cast (Cw)
 
Active layer soil wedge with primary infilling (Alp) fine-grained substrate MAAT < -1 to 0°C; coarse-grained substrate MAAT < -3 to -4°C; indication of Tjan < -8°C
Seasonally frozen ground soil wedge with primary infilling (Sfp)
Active layer soil wedge with secondary infilling (Als)
Seasonally frozen ground soil wedge with secondary infilling (Sfs)
Vertical platy microstructures (Vps) thermal contraction cracking of relatively thin layer; sudden temperature drop
Type 1 individual folds of small amplitude and large wavelength seasonally frozen ground, permafrost 
Type 2 down sinking (Type 2a) or updoming (Type 2b) fine-grained substrate MAAT < -4°C, and coarse-grained substrate MAAT < -8°C 
Type 3 down sinking (Type 3a) or updoming (Type 3b) seasonally frozen ground, permafrost
Type 4 drops (Type 4a) or diapirs (Type 4b) seasonally frozen ground, permafrost
Type 5 solitary form (Type 5a), polygons (Type 5b), or updomed and depressed (Type 5c) seasonally frozen ground, permafrost
Type 6 other irregular structures cryostatic pressure or cryohydrostatic pressure: seasonally frozen ground, permafrost
Perennial frost mounds
 
Open-system pingo (Osp) MAAT < -2° - -4° C; continuous and discontinuous permafrost zone
Closed-system pingo (Csp) MAAT < -6°C; continuous permafrost zone
Palsa (Pa) organic palsa MAAT < -1°C; mineral palsa MAAT < -4 to -6°C
Earth hummock (Eh), thufur (Th) seasonally frozen ground, permafrost zone, MAAT < +3°C
Cryoplanation and mass-wasting
 
Cryoplanation terrace (Cpt) MAAT < -1°C
Frost creep (Fc) periglacial environment
Gelifluction (Gf) MAAT < -2°C
Grèze litées (Gl) periglacial environment
Cryogenic microfabrics
 
Banded fabrics (Bf) frost action: seasonally frozen ground or active layer
Lenticular platy microstructures (Lpm) ice segregation process (seasonally frozen ground, active layer, permafrost)
Structural sequence with a gradual increase of lenticular platy microstructure (Ssg) seasonally frozen ground
Structural sequence with a microstructural unconformity (Ssu) transition from active layer to permafrost horizon: permafrost conditions
Cryogenic microfabrics in cave deposits MAAT < 0°C
4.1.2. Table PEDOLOGI

The table PEDOLOGI describes palaeopedological information related to palaeoperiglacial environments.

Table 4.3. Field description of database table PEDOLOGI.


Field name Field type Field length Deci-mals Description / Example
PEDOLOG_ID Character 7   Unique event number, e.g. PD549
EVENT Character 20   The local or regional name of the buried palaeosol e.g. Kesselt soil
DATED_BY Character 40   Type of age information, e.g. age of the parent material
SEDENV Character 2   Type of depositional environment, e.g. Fluvial, Aeolian sand/silt, Glacial, Lacustrine.
PARENTMAT Character 2   Parent material of the palaeosol i.e. Clay, Silt, Sand, Gravel, in situ weathered Hard rock, Other
NONUNIFPM  Character 2   Non-uniform parent material, i.e. Lithological Contact or Erosional Surface within parent material
MINERALPM Character 10   Mineralogical composition of the parent material (in %) Quartz, Feldspar, and Heavy Minerals (e.g. Q67F33)
GEOMORPH Character 1   Palaeogeomorphological position in which the palaeosol formed, e.g. Upland, Hillslope, Bottomland, Channel, Other
TOPOSEQ Character 1   Is the palaeosols developed as a toposequence ? (Y/N)
DRAINAGE Character 1   Drainage of the palaeosol: Excessively drained, Well drained, Imperfectly to moderately drained, Poorly drained
CHARCOAL Character 1   Presence of charcoal (Y/N)
ORGANISM Character 2   Presence of traces of soil organisms or biological activity (Coleoptera, Molluscs, other Fauna, botanical Macroremains, Phytoliths, Roots, Bioturbation, etc.)
SOILCOLOUR Character 8   Soil colour of the B horizon (as Munsell notation)
RELCRYOSTR Character 1   Cryogenic macrostructure(s) or microfabric(s) directly related to the palaeosol (Y/N)
DESCR_CRYO Character 40   Short description of the related cryogenic macrostructure(s) or microfabric(s). See par. 2.1.1.1.
ADDPROPERT Character 40   Short description of additional soil properties, see par. 2.1.2.1.
TYPE  Character 2   Type of palaeosol: Truncated palaeosol, Polycyclic palaeosol, Pedocomplex, Accretionary palaeosol, Exhumed palaeosol, or Unknown type of palaeosol
SOILFORMR Character 2   Generalized soil-forming regime, e.g. Gleization, Podzolization, Lessivage, Ferrallitization, Calcification, Salinization, Braunification, Other
SEQSOILHOR Character 12   Sequence of soil horizons from top to bottom, e.g. AbtCCr
THICKNESS Numeric 5 2 Total thickness of the palaeosol profile (in metres)
STAGEDEV       Stage of development of the palaeosol (see par. 2.1.2.2: Vw, W, M, S, Vs)
CLASSSYST Character 1   Classification of the palaeosol according to Usda Soil Taxonomy system, Fao, Other
CLASSNAME Character 20   Name of the classified palaeosol, e.g. Gelic Gleysol
CLASSAUTH Character 1   Is the classification of the palaeosol in accordance with the opinion of the author (Y/N)?
MICROANAL Character 1   Is the interpretation of palaeosol features/properties based on micromorphological analysis (Y/N)?

4.1.2.1. Contents of field ADDPROPERT.

This field contains a short description of additional soil properties, e.g. organic matter content of the A horizon, clay content due to weathering, type of clay minerals, illuviated clay content in the Bt horizon, decrease in calcium carbonate content in the soil profile, stage of calcium carbonate accumulation, e.g. stage V. The stage of of calcium carbonate accumulation is classified according to Retallack, 1990:

Table 4.4. Stage of calcium carbonate accumulation according to Retallack, 1990 (table 13.2).


Stage Palaeosol developed in gravel Palaeosol developed in sand, silt or clay
I Thin discontinuous coatings of carbonate on underside of clasts Dispersed powdery and filamentous carbonate
II Continuous coating all around and in some cases between clasts: additional discontinuous carbonate outside main horizon Few to common carbonate nodules and veinlets with powdery and filamentous carbonate in places between nodules
III Carbonate forming a continuous layer enveloping clasts: less pervasive carbonate outside main horizon Carbonate forming a continuous layer formed by coalescing nodules: isolated nodules and powdery carbonate outside main horizon
IV Upper part of solid carbonate layer with a weakly developed platy or lamellar structure capping less pervasively calcareous parts of the profile
V Platy or lamellar cap to the carbonate layer strongly expressed: in places brecciated and with pisolites of carbonate
VI Brecciation and recementation as well as pisoliths common in association with the lamellar upper layer

4.1.2.2. Description of contents of field STAGEDEV.

The stage of palaeosol development is classified according to Retallack, 1990:

Table 4.5. The stage of palaeosol development according to Retallack, 1990 (table 13.1).


Stage Features
Very weakly developed Little evidence of soil development apart from root traces: abundant sedimentary, metamorphic or igneous textures remaining from the parent material.
Weakly developed With a surface rooted zone (A horizon) as well as incipient subsurface clayey, calcareous, sesquioxidic or humic, or surface organic horizons, but not developed to the extent that they would qualify as USDA argillic, spodic or calcic horizons or histic epipedon.
Moderately developed With surface rooted zone and obvious subsurface clayey, sesquioxidic, humic or calcareous or surface organic horizons: qualifying as USDA argillic, spodic, or calcic horizons or histic epipedon and developed to an extent at least equivalent to stage II of calcic horizons (Table 13.2).
Strongly developed With especially thick, red, clayey or humic surface (B) horizons or surface organic horizons (coals or lignites) or especially well developed soil structure or calcic horizons at stages III to V (Table 13.2).
Very strongly developed Unusually thick surface horizons (B) or surface organic horizons (coals or lignites) or calcic horizons of stage VI: such a degree of development is mostly found at major geological unconformities.

The palaeoclimate interpretation of a palaeosol is either based on the analysis of the individual soil properties, i.e. an environmental factor approach or comparison of the classified palaeosol with the present-day distribution of similarly classified soils (e.g. Bronger & Catt, 1989; Catt, 1979, 1991; FitzPatrick, 1983).

Time and climate related soil properties include organic matter content, clay content and clay mineralogy, illuviated clay content (Bt), soil colour, calcium carbonate content and depth to calcic horizon (Bk horizon). As far as palaeoclimate information is based on individual soil properties, only general palaeoclimate information can be inferred (see table 2.6). Nevertheless, the environmental factor approach is preferred, as changes in a particular (environmental) factor (e.g. climate) at a specific (geological) time-slice can be studied by choosing palaeosols for which other environmental factors (e.g. drainage, parent material, palaeotopography, etc.) were similar. In order to infer palaeoclimate information from a palaeosol, an advanced assessment of the relevant environmental factors of the involved palaeosol should be included; palaeoclimate information is only reliable when local environmental factors are eliminated.

Comparison of the palaeosols with the present-day distribution of similarly classified soils is primarily based on the zonal distribution of soils (i.e. climate and vegetation controlled). However, the intrazonal soils are developed as a result of the ('overruling') influence of some specific local factor (i.e. environmental factor) other than climate. For example, gleization is such a process, i.e. gleization reflects local waterlogging rather than wider effects of climate and vegetation evident from other soil-forming processes. Finally, azonal soils are poorly developed soils such as recent alluvial or stony mountain soils.

Table 4.6. Paleoclimatic information from palaeosols.


EVENT

(palaeosol property)
PALAEOCLIMATE

(indication/information)
Classified palaeosol The classified palaeosol may be compared with the areal distribution of its present-day equivalent; the present distribution of the soil gives an indication of the palaeoclimate parameters
Distribution and size of roots good criteria of palaeosol identification
Cryogenic macrostructure or microfabric see record periglacial
Phytoliths, Charcoal Indication of grasses and fire in (wooded grassland) vegetation respectively; under natural conditions, charcoal suggests a seasonally dry climate.
Soil colour Red colour: haematite, seasonal climate with hot warm summers. Brown colour: goethite, cool humid regions with little seasonal variation in climate. Time-controlled feature as well.
Clay content produced by mineral weathering Low temperature and low precipitation: no increase in clay content. Weathering under high temperature and high precipitation: greatly increased clay content.
Clay illuviation (illuviated clay content) Bt horizons: favoured by pH 4.5 - 6.5, small amount of cementing and flocculating agents, permeable soil profile, seasonal rainfall distribution, and a deciduous broadleaf woodland vegetation.
Clay mineralogy Tropic regions: kaolinite and gibbsite (halloysite). Semi-arid: montmorilloniet (very arid regions: palygorskite and sepiolite). Temperate humid: vermiculite and illite.

Smectite: semi-arid, evotranspiration exceeds rainfall. Humid regions: kaolinite, halloysite. Tropic regions: gibbsite. Impeded drainage: smectite.
Calcium carbonate content see Table; as calcium carbonate is easily weathered, its presence suggests a dry climate. Calcium carbonate stabilizes the organic matter and reduces the humification process. Time-controlled feature as well.
Depth of calcic horizon (Bk) Depth below surface reflects depth of wetting of the soil by available water (seasonal distribution of precipitation, evapotranspiration): in climates with a marked dry-season the calcic horizon is closer to surface. Other factors are drainage, parent material, and influx of calcareous dust. Time-controlled feature as well.
Organic matter content Hot and cold desert have little organic matter production (low precipitation); tropical forest have a high production and rapid decomposition; humid temperate regions have high rainfall, weak evapotranspiration, and a relatively low temperature prevents decomposition. Time-controlled feature as well.
Drainage Chemical weathering below the water table is slow (pyrite, marcasite and siderite nodules in permanently waterlogged soils). Within zone of fluctuation oxidizing and reducing conditions (nodules and mottles of gleyed horizons, e.g. Bg). Above the zone of water-table fluctuation are formed most other kinds of soil horizons, such as Bt horizon (oxidized horizons with red, yellow, or brown iron oxyhydrate colours.

4.2. Events recorded in depositional environments

The tables in this category pertain to events recorded in sedimentary environments such as aeolian, fluvial, lacustrine, or glacial. Because the compilation of data for the lacustrine and glacial environments is still under progress, these tables have not been included.

4.2.1. Table AEOLIAN.

The table AEOLIAN stores information on aeolian deposits (including sedimentary facies and structures) and related geomorphological features such as dunes.

Table 4.7. Field description of database table AEOLIAN.


Field name Field type Field length Deci-mals Description / Example
AEOLIAN_ID Character 7   Unique event number, e.g. AE3847
EVENT Character 40   Type of event, e.g. formation of (river)dunes, ridges, coversand sheet, loess, tephra, desert pavement
DATED_BY Character 40   Type of age information, e.g. initiation aeolian activity. See par. 2.1.1.2.
RELATEDDAT Memo     Comments on age information
DURATION Numeric 8 0 Estimation of duration event in years
LITHSTRAT Character 10   Lithostratigraphical position, e.g. Older Coversand I
MORPHOLOGY Character 6   Landform, e.g. Parabolic, Linear, Slightly undulating, Sand Sheet
FACIES Character 20   Sedimentary facies of the deposits. See par. 2.2.2.1.
PALAEOGEOM Character 20   Palaeogeomorpholocal position, e.g. upland, river terrace
CROSSBED       Cross bedding/lamination present? Y/N
HEIGHT_CB Numeric 6 2 Height of the cross-bedded/laminated strata in cm
DIR_CB Numeric 3 0 Direction of the cross-bedded/laminated strata (foreset direction in ° over north)
FLUVIAL Character 40   Short description of any fluvial structures within the aeolian strata, e.g. low-energy sheet flow
LITHOLOGY Character 40   Lithological characteristics, e.g. loamy fine sand
MODE Numeric 5 0 Modal grainsize in m m
THICKNESS Numeric 6 2 Thickness of deposit in m.
ACCUMRATE Numeric 6 2 Estimation of accumulation rate (in cm/year)
SOURCEAREA Character 20   Source area of deposit, e.g. Maas river plain
VEGETATION Character 40   Short description (palaeo)vegetation surrounding the site
HUMAN_INFL Character 40   Description of possible human influence on event/, e.g. reactivation processes by slash-and-burn

4.2.1.1. Contents of field FACIES.

The field FACIES contains a description of the type of eolian deposit encountered in terms of lithology and overall sedimentary sturcture. In most cases the description will speak for itself. ?Alternating bedding? refers to a typical facies encountered in the west-European aeolian sands deposited in the periglacial zone of the last glacial. It consists of an alternation of thin beds (cm scale) of sand and silty sand or silt (Schwan, 1986).

4.2.2. Table FLUVIAL

The table FLUVIAL contains information on the fluvial sedimentary environment, in particular information on the fluvial facies and erosion / aggradation events. Although quantitative palaeoclimatic or palaeohydrologic information rarely can be derived from this type of data, a qualitative interpretation of climate-related changes in water and sediment discharge of palaeoperiglacial rivers still may be obtained (e.g. Van Huissteden, 1990; Mol, 1997).

Table 4.8. Field description of database table FLUVIAL


Field name Field type Field length Deci-mals Description / Example
FLUVIAL_ID Character 7   Unique event number, e.g. FL653
EVENT Character 25   Type of event, e.g. fluvial aggradation
DATED_BY Character 40   Type of age information, e.g. initiation of channel downcutting. See par. 2.1.1.2.
RIVERTYPE Character 6   River type: Braided, Meandering, Anastomosing, Sheet Floods, Incising river
RELATEDDAT Memo     Comments on age information
DURATION Numeric 7 0 Estimation of duration event (in years)
NAME Character 20   River name e.g. Schwarze Elster
PRES_TYPE Character 2   Actual river characteristics e.g. Meandering, Braided, Anastomosing, Straight, Not known
TERRACE Character 40   Regional or local name of river terrace, e.g. Main Terrace
FACIES Character 40   Short description of the fluvial facies, e.g. channel fill
MASSIVE Character 1   Presence of massive (non-stratified) sediment Y/N
HORBED Character 1   Presence of horizontal bedding/lamination Y/N
CROSSBED Character 1   Presence of cross bedding/lamination Y/N
HEIGHTCB Numeric 6 2 Height of cross bedded/laminated sets in cm
FINCOUPW Character 1   Presence of Fining or Coarsening upward sequence(s)
FCLENGTH Numeric 6 0 Length of fining/coarsening upward sequence(s) in cm
BEDLOAD Numeric 8 0 Maximum grainsize in channel in m m
GRAINSIZE Numeric 8 0 Average grainsize in m m
ICERAFTED Character 1   Is there evidence for sediment transport via ice-rafting? Y/N
WDRATIO Numeric 6 2 Channel width/depth ratio
GRADIENT Numeric 6 0 Gradient of river at time of event in cm/km
SINUOSITY Numeric 6 2 Sinuosity value for meandering river
FLOODING Character 1   Is there evidence for floodings? Frequent, Rare, No
VEGETATION Character 40   Short description of the (palaeo)vegetation that surrounds the site
AEOLIAN Character 40   Short description of any aeolian activity related with fluvial deposit, e.g. fluvial reworked aeolian sands
TECTONICS Character 15   Tectonic setting, e.g. uplift, subsidence
HUMAN Character 40   Short description of human influence on river system/event

5. CHRONOSTRATIGRAPHICAL INFORMATION IN TABLE AGE

Within the table 'age' the absolute age of an event can be inscribed. An event may take place at a specific moment or during a period/interval; a period/interval is embraced by two absolute radiometric datings (14C, TL), i.e. a lower and an upper age. In addition, related (intervening) dates may be classified as 'Additional' ('many ages to one event') such as a TL and an OSL date of one event. Finally, the date of an event may be inferred from a synchronous event (e.g. Laachersee Tephra), or inferred from its stratigraphic position (according to the chronostratigraphic classification, e.g. Late Pleniglacial).


Field name Field type Field length Deci-mals Description / Example
AGE_ID Character 6   Unique age identifier, e.g. A4375
AGE Numeric 8 0 Age in siderial or radiocarbon years, depending on dating method
LABNR Character 11   Laboratory number of age determination
SAMPLE_POS Character 1   Lower age of the event, i.e. sample from the base, or Upper age, i.e. sample from the top, or (related) Additional
METHOD Character 5   Dating method, e.g. conventional 14C, Ams, Dendrochronological, TL, OSL, U/Th, Varve, Stratigraphical correlation
AGEBASEDON Character 50   Further information on dating method, e.g. the age of an associated dated event in the database
SDEV_UP Numeric 8 0 Upper standard deviation of age determination
SDEV_LO Numeric 8 0 Lower standard deviation of age determination
CALIBRATED Numeric 8 0 Calibrated age in years BC/AD
CALSDEV_UP Numeric 8 0 Upper standard deviation of calibrated age
CALSDEV_LO Numeric 8 0 Lower standard deviation of calibrated age
CALMETHOD Character 1   Calibration method e.g. Stuiver and Pearson, Unknown
INFINITE Character 1   Age beyond limit of applied dating technique ('infinite age') Y/N
MATERIAL Character 25   Dated material, e.g. betula leaf, organic bulk, fine sand (quartz, K-feldspar)
FROM Character 25   Context of sample, e.g. gyttja in palaeomeander
TYPEDAT Character 2   14C-dating is on the Extract (coarse/fine), Residue (coarse/fine), CaCO3, or Unknown
VERTDIST Numeric 7 2 Vertical distance over which a bulk sample is taken in cm
DELTAC13 Numeric 7 2 d 13C value in ?
SOURCE_ERR Character 50   Possible sources of error on age determination and error correction measures 
ENRICHED Character 1   Isotopic enrichment has been applied by Thermal diffusion column or Laser beam
STANDARD Character 1   Standard that has been applied to quote isotopic ratios: PDB, SMOW, Other
DELTA18O Numeric 7 2 d 18O in ?

Table 3.1. Field description of database table AGE.

6. TABLE PROXY

Within the table 'proxy', the properties of the proxies such as age, type of event (e.g. periglacial, fluvial, aeolian etc.), and site information is jointed together. First of all, one site may have one or more events. Each event is linked to an age, although different events may have a similar age (e.g. thermal contraction cracking related to soil formation). In addition, one event may have more than one age, e.g. a base and top age (and possibly (a cluster of) related ages in between).


Field name Field type Field length Deci-mals Description / Example
PROXY_ID Character 8   Unique proxy identifier, e.g. 2335
EVENT_ID Character 7   Event identifier, e.g. a periglacial event, PE3241
AGE_ID Character 6   Age identifier, e.g. A3242
SITE_ID Character 6   Site identifier, e.g. S345

7. REFERENCES

Bronger, A. and J.A. Catt 1989. Paleosols: problems of definition, recognition and interpretation. Catena Supplement 16: 1-7.

Catt, J.A. 1979. Soils and Quaternary Geology in Britain. Journal of Soil Science 30: 607-642.

Catt, J.A. 1991. Soils as indicators of Quaternary climatic change in mid-latitude regions. In: M.J. Pavich (ed.). Weathering and Soils. Geoderma 51: 167-187.

FitzPatrick, E.A. 1983. Soils, their formation, classification and distribution. Longman, London, 353 pp.

French, H.M. 1996. The periglacial environment. Addison & Wesley, Longman, London, 2nd edition, 345 pp.

Harris, S.A., H.M. French, J.A. Heginbottom, G.H. Johnston, B. Ladanyi, D.C. Sego and R.O. Van Everdingen 1988. Glossary of Permafrost and Related Ground-Ice Terms. National Research Council of Canada, Ottawa Ontario Canada Technical Memorandum No. 142, 155 pp.

Huijzer, A.S. 1993. Cryogenic microfabrics and macrostructures: interrelations, processes and paleoclimatic significance. Thesis, Vrije Universiteit, Amsterdam. Copyprint, Enschede, 245 pp.

Huijzer, A.S., and R.F.B. Isarin 1997. The reconstruction of past climates using multi-proxy evidence: an example of the Weichselian Pleniglacial in Northwest and Central Europe. Quaternary Science Reviews, 16: 513-533.

Isarin, R.F.B. 1997a. The climate in north-western Europe during the Younger Dryas. A comparison of multi-proxy climate reconstructions with simulation experiments. Thesis, Vrije Universiteit, Elinkwijk, Utrecht, 159 p.

Isarin, R.F.B. 1997b. Permafrost distribution and temperatures in Europe during the Younger Dryas. Permafrost & Periglacial Processes 8: 313-333.

Karte, J. 1979. Raumliche Abgrenzung und regionale Differenzierung des Periglaziars. Thesis, Bochum, 211 pp.

Karte, J. 1983. Periglacial phenomena and their significance as climatic and edaphic indicators. GeoJournal 7: 329-340.

Lowe, J.J. et al. 1994. Climate changes in areas adjacent to the North Atlantic during the last glacial-interglacial transition (14-9 ka BP): a contribution to IGCP-253. Journal of Quaternary Science 9: 185-198.

Mol, J. 1997. Fluvial response to climate changes in the Niederlausitz, Germany. Journal of Quaternary Science 12(1): 43-60.

Mol, J., J. Vandenberghe, K. Kasse and H. Stel 1993. Periglacial micro-jointing and faulting in Weichselian fluvio-aeolian deposits. Journal of Quaternary Science 8: 15-30.

Renssen, H. 1997. The climate of the Younger Dryas stadial; comparing global atmospheric simulation experiments with climate reconstructions based on geological evidence. Thesis, Utrecht University. Netherlands Geographical Studies 217.

Retallack, G.J. 1990. Soils of the past. An introduction to paleopedology. Unwin Hyman Ltd., London, 520 pp.

Schwan, J. 1986. The origin of horizontal alternating bedding in Weichselian aeolian sands in northwestern Europe. Sedimentary Geology 49: 73-108.

Vandenberghe, J. 1988. Cryoturbations. In: M.J. Clark (ed.). Advances in periglacial geomorphology. John Wiley and Sons Ltd., Chichester, p. 179-198.

Vandenberghe, J. 1992. Cryoturbations: a sediment structural analysis. Permafrost and Periglacial processes 3: 343-351.

Vandenberghe, J. and A. Pissart 1993. Permafrost changes in Europe during the Last Glacial. Permafrost and Periglacial Processes 4: 121-135.

Van der Hammen, T. and T.A. Wijmstra, eds. 1971. The Upper Quaternary of the Dinkel valley. Mededelingen van de Rijks Geologische Dienst N.S. 22: 55-213.

Van Huissteden, J. 1990. Tundra rivers of the last glacial: sedimentation and geomorphological processes during the Middle Pleniglacial in Twente, Eastern Netherlands. Mededelingen Rijks Geologische Dienst 44(3): 1-138.

Washburn, A.L. 1979. Geocryology. Edward Arnold, 406 pp.

APPENDIX I. GLOSSARY

Accretionary soil

Buried slowly so that development continues, to produce a accretionary soil (may be a clue that the soil formed n a low-lying part of the landscape).

Buried soil

A soil that is buried rapidly beneath thick deposits which seal it from the atmosphere and prevent further development.

Cryostatic pressure

Volumetric expansion of freezing water (i.e. frost heave)

Cryo(hydro)static pressure

Pressure exerted by water between freezing fronts (conform Washburn, 1979).

Composite wedge cast

A wedge showing evidence of both primary and secondary infilling

Drainage

Classification slightly modified according to the Soil Survey Manual (1975). Entirely above the water table (excessively and well drained), partly or wholly within the water table fluctuation (imperfectly to moderately drained), or entirely below the water table (poorly drained).

Earth hummock

A hummock having a core of silty and clayey mineral soil and showing evidence of cryoturbation; a type of non-sorted circle; commonly found in the continuous permafrost zone (a type of nonsorted circle).

Exhumed soil

Buried and then re-exposed by erosion, to form an exhumed soil.

Frost mound

Mound-shaped landform produced by ground-freezing combined with groundwater movement or the migration of soil moisture.

Palaeosol

A soil formed in a landscape of the past (including buried soils, relict soils and exhumed soils !).

Pedocomplex/Compound soil

Where two or more soils, perhaps partly truncated, are separated by a thin sediment layer showing pedogenetic alteration, the resulting profile is termed a compound soil or pedocomplex.

Periglacial loading

Sediments may sink down under gravitational force in the underlying sediments, while the lower material may rise in the upper deposits. Essential conditions: reversed density gradient and liquefaction

Polycyclic/Composite soil

A soil in which a similar soil-forming phase is at least repeated twice (e.g. clay illuviation), interrupted by another soil-forming phase (cryogenic disruption of clay coatings).

Relict/Ancient soil

Soils that continue to develop beneath a stable land surface subject to changing environmental conditions (relict soils or ancient soils, i.e. polygenetic).

Seasonally frozen ground

Zone in the periglacial environment beyond the (sporadic) permafrost zone where the ground freezes seasonally.

Soil wedge

The soil wedge differs from the sand and ice wedges that they do not occur in perennial frozen ground, i.e. either in seasonally frozen ground or in active layers (on permafrost).

Soil wedges with primary infilling

Remark: discrimination between a soil wedge and a (permafrost) sand wedge may be problematic

Soil wedge with secondary infilling

Soil wedge corresponds to the primordial soil wedge, ice vein, or sag vein

Truncated soil

Partially eroded to form a truncated palaeosol

Thufur

Perennial hummock formed either in the active layer in discontinuous permafrost zone or seasonally frozen grounds during ground freezing (a type of nonsorted circle).

APPENDIX II. NOTES ON FILE TYPES

The file types of the data files have the following extensions.

dBASE files:

.DBF Table file

.DBT Memo text field contents of table

.MDX Index file

.QBE Query-by-example

.QBO Result table of query

ASCII text files:

.TXT Table file in SDF format

. SCH Field description of tables

In SDF format files, records are terminated by newline characters. Fields are not separated by special characters and contain the same number of characters as the original dBASE field length.