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