Figure 3. This photo shows a close-up of the top of the gravel pit face seen in the upper right of Figure 2. Note the topset/foreset contact to the left of the person. To the right of the person, the coarse-gravel topsets of the delta are interupted by sand and pebbly gravel. Modern bank swallows made the holes in the sandier material, in which they prefer to build their nests. These finer-grained deposits are contorted at their base, and become less deformed up-section. This feature is an infilled kettle-hole, where a melting ice block became covered by the stream deposits. Over time as the ice block melted, the deposits collapsed into the kettlehole and were subsequently covered by more stream outwash, which show more gentle downwarping than the lower material in the kettle, reflecting a smaller but still dwindling ice block. The sequence is mantled by windblown material, which contains frost-heaved stones. Click on each photo for an enlarged view.
Last updated on October 6, 2005