Giant stair steps
Dana Glacier, Yosemite National Park is an example of a cirque glacier.
|Photo: G.K. Gilbert. 1903. USGS Photographic Library, photo ggk03277. < http://libraryphoto.cr.usgs.gov/> Accessed June 2010.
The topographic map to the left has two examples of cirque glaciers, both of which are labeled. The glaciers are symbolized with
blue contour lines and delimited with a dashed blue line. The glaciers do not extend beyond the edges of their cirques, although
the extent of the moraine deposits indicates the glaciers were larger in the past than they are today. Glacial troughs exist
down-valley from these cirque glaciers (not shown on this portion of map) indicating that these cirque glaciers grew sufficietly
large in the past to form valley glaciers that extended well beyond the portion of the landscape shown in the map.