Rills cut into wall of Cypress Hills gravels, located between ridges of gravel due to bulldozing on top. Notice resemblance to jointing. Two persons on top.
Rills cut into wall of Cypress Hills gravels, located between ridges of gravel due to bulldozing. View of the bull-dozed ridges on top. Stu Jordan in picture.
Map of Great Lakes region showing the general distribution of end moraines formed after the Wisconsin stage of the Pleistocene. The moraines are shown in heavy black lines. The shaded area was never covered by the Pleistocene ice sheet. The area between the Wisconsin drift boundary and pre-Wisconsin Pleistocene deposits (Zumberge, 1958, p. 348).
Restoration of a Pleistocene mastodon (above) and a Pleistocene Woolly mammoth (below). A tooth of each is shown with a hand for scale. The crowned tooth of the mastodon was suitable for diet of twigs, branches and cones, whereas the infolded structure of the mammoth tooth was more adapted to a grass diet (Zumberge 1958, p. 362).