Glacial striations EarthCache
Misha: Received complaints that this is a Rainbow action spot, archiving for cacher safety :(
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Glacial striations or glacial grooves are scratches or gouges cut into bedrock by process of glacial abrasion. Glacial striations usually occur as multiple straight, parallel grooves representing the movement of the sediment-loaded base of the glacier. Large amounts of coarse gravel and boulders carried along underneath the glacier provide the abrasive power to cut the grooves, and finer sediments also in the base of the moving glacier further scour and polish the bedrock.
Most glacial striations were exposed by the retreat of glaciers since the Last Glacial Maximum. As well as indicating the direction of flow of the glacial ice, the depth and extent of weathering of the gouges may be used to estimate the duration of post-glacier exposure of the rock.
Glaciers Sculpted the Landforms
A huge ice sheet, several kilometers thick, covered much of Nova Scotia between 10,000 and 70,000 years ago. Glacial action yielded distinctive erosional and depositional features.
Erosion of the landscape included the gouging and plucking out of boulders and rocks, so that depressions were carved. Rocks at the base of moving glaciers left scratches called glacial striations on the bedrock surface. Bogs and small marshy lakes are also features of glaciations; they formed because of poor drainage of the hollows that were eroded by glacial action.
As they moved, the glaciers also deposited a mixture of unsorted rocks, gravel, sand and clay known as glacial till. This till formed hill-like drumlins such as Citadel Hill, McNabs Island, Georges Island and other hills in the Halifax area. There is also a series of drumlins along the east coast of St. Margaret’s Bay. As the glaciers retreated, boulders or erratics were deposited. Today, numerous erratics can be seen on the landscape of Peggys Cove.
Please Email me the direction that the glacial striations point, and where the erratics that cut into the bedrock likely ended their journey towards the Atlantic Ocean.
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*** Every log must include a picture, if you take a group shot then you all must post it individually or you risk having your log deleted.
Misha
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