258 Glaciers C. Continental glaciers At high latitudes (e.g. at Greenland and at

Question

258 Glaciers C. Continental glaciers At high latitudes (e.g. at Greenland and at Antarctica) glacial ice presently ex- tends across valleys and uplands alike, completely masking topography. These are continental glaciers. (Recall the map of Greenland in Figure 14.2 or the first page of this exercise, 249.) Laurentide Ice s During the Pleistocene Epoch, which ended around 10,000 years ago, depressed global temperatures sent Lau- rentide continental glaciers southward out of Canada into the lower 48 States (Fig. 14.13A). The Great Lakes and myriad other features in North Amreica are bold re- minders of this most recent continental glacial event. Q14.13 Undersea mapping has revealed what appears to be bodies of continental glacial deposits on the Laurentide ice was approximately along today's Missouri and Ohio Rivers. B Myriad continental shelf offshore of New England similar to those in Figure 14.13B. What could possibly explain this curious occurrence of continental Flgure 14.13 A This shows the approximate maximum extent of Pleistocene glaciation on present-day Canada and our conterminous 48 states. The southern limit of landscape features in coastal New England owe their origins to Laurentide glaciers. Cape Cod glacial deposits now well beneath the Atlantic? Hint: From whence comes the water that goes to make glacial ice? Rhode New York Connecticut e Martha's New Vineyard Nantucket Jersey Long Island al shelt Prominent continental glacial deposits 025 50m

Explanation / Answer

Two reasons

1. Transgression and regression

2. Icebergs

The reason for the occurrence of the continental glacial deposit well beneath the Atlantic ocean is related to the regression of the sea. During the ice age, all the water from the sea comes to the continent and the water level of the sea drop(regression). The water from the deep seas gets deposited as large continental glaciers. The ice shelves develop, which connect these continental glaciers to the shallow water sea. Now, these ice shelves are rich in continental sediments. When the ice age over, the ice melt and the sediments that earlier bound by ice shelves get deposited on the surface and the surface covered by the water(what we called a part deep sea).

2. Icebergs

When the iceberg melts it drops its sediments down onto the sea floor, and deep glacier deposit will develop.

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