Figure 2. Shaded relief (A) and topographic (B) maps showing the same area at the mouths of the Little Cottonwood and Bells Canyons in the western Wasatch Mountains. Here, valley glaciers deposited terminal moraines at the foot of the mountains, just above the eastern shoreline of Lake Bonneville (at altitude 1550 m asl). At Bells Canyon, the distal portion of the terminal moraine is overlain by lacustrine gravel from Lake Bonneville. Although this stratigraphic relationship indicates that glaciers advanced to the mouth of the canyon before the Lake Bonneville highstand, numerical dating indicates that glaciers continued to occupy their moraines in this area during the highstand (see text for more details). Geologic mapping is from Scott and Shroba (1985). In the lower image, shading indicates the area covered by ice during the last glaciation. Notice how the ice margin coincides with the moraine crests at the mouth of Bells Canyon. “Pinedale” refers to sediment during the last glaciation, and “Bull Lake” refers to sediment deposited during the penultimate glaciation.
Image 18417 is a 1527 by 1198 pixel WebP
Uploaded:
Jan4 10
