|
||||||
|
|
||||||
 |
 |
 |
 |
|
|
|
|
||
 |
Perched erratic boulder, North West Territories, Canada.
This large granite boulder is resting above glacially rounded bedrock. The large boulder was positioned when an ice sheet carrying rocks eventually melted. Then, the debris within the melting glacier settled out, placing the large on top of the smaller boulders.
(Source: Natural Resources Canada. Photograph by Lynda Dredge. Copyright Terrain Sciences Division, Geological Survey of Canada.)
