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.
Esker - Well defined sand and gravel ridge deposited by glaciofluvial processes.
Crevasse Fill - Short, straight, sand and gravel ridge (parallel or perpendicular to ice flow direction).
Till Ridge - Distinct till ridge (unsorted clay, silt, sand, gravel, and boulders).
