GEOLOGIC CONTACTS AND LANDFORMS
Geologic Contact - Well defined geologic contact.
Geologic Contact - Inferred, gradational, or approximately located geologic contact.
Channel Scarp - Well defined channel scarp or boundary of outwash channel.
Channel Scarp - Inferred or approximate location of channel scarp or boundary of channel.
Drumlin - Elongated oval ridge of compacted till that forms under the ice margin and is shaped 
by ice flow.  The arrow indicates the direction of ice flow, the long line indicates the length 
of the drumlin, and the short line indicates the approximate maximum width of the drumlin.
