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[[circled]] 15 [[/circled]]
Up ravine past igneous plugs.
Saw same section as elsewhere. Went up thru thick bioherm with Scacchinella in lower part. Saw no good silicified pieces. Above the ls. bed with spicules comes thick chert capped by a sandbank type bioherm with Perrinites at top. This is followed by the thin bedded zone.
[[sketch of geologic column in left margin]]

Spicule bed
--------------|
ls 30'        |
--------------|
Chert &       |
occasional ls.|
--------------|
Bioherm       |
              |
[[/sketch]]

M24672 [[insert]] = 738q [[/insert]] - is 2 small pieces of ls from between the chert and the bioherm = basal spicule bed. Contains some fusulines. Ammonite from top of spicule zone.
Between the spicule bed and the bioherm is much rubble from the bioherm.
Biggest bioherm is at north bend of stream.
[[margin note]] 738r = [[/note]] M24673 - Slope exactly 1/2 mile E of the igneous plug - 3 blocks.
[[margin note]] 738s [[/note]] M24674 - 1 1/2 miles E of plug, near top of bioherms.
[[margin note]] 738t [[/note]] M24675 - Float from transition zone, 1/2 mile E of volcanic plug.