Slocum Alluvium
Cenozoic, about 2.6 to 0.0 million years old. 4 crags on this site have their map point on it.
What the map says
Bouldery cobble gravel near mountain front, decreases in grain size eastward away from mountains. Much calcium carbonate (CaCO3) in upper part where not removed by erosion. Many unsound stones. Thickness generally less than 7.6 m. Forms gently sloping surfaces 24 to 36 m above present streams.
1:100,000 sheet: Trimble and others, 2003, U.S. Geological Survey Geologic Investigations Series I-856-H (2 crags). A contact line at that scale is about 100 m wide on the ground.
Brown to white cobble and boulder gravel as much as 20 feet (6 m) thick. Most clasts are well-rounded igneous and metamorphic rocks; some are sedimentary; most are weathered and have thin rinds of calcium carbonate. Well-developed soil profile consists o Lithology: alluvium.
1:100,000 sheet: Colton, Roger B., 1976, U.S. Geological Survey Geologic Investigations Series I-855-G (2 crags). A contact line at that scale is about 100 m wide on the ground.
Served by Macrostrat (CC BY 4.0). The wording is the map's own, quoted as a fact about the mapped unit, not about any one wall.