Field Notebook: SD, WY 1956
Page 37
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Transcription
Notes on Cloverly in So. Central Wyoming & Adj. areas Red Buttes area: At road cut on Wyo 220 Mowry - well exposed, considerable soft sh at top. "Muddy" = ledge former Thermop. with black sh. poorly exposed, Some worm-tracked silts. No contact with Cloverly exposed. Further west, near narrows through "Muddy", Cloverly consists almost entirely of ss and cgl ss. In bluffs S of Wyo 220 ancqite; light buff-white woth ss, massive, x-lam, loc. frizzle is at top. It either grades to or is underlain by a massive, harder, conform + cgl ss with chert + qtzte pebbles up to 1"½" diam, commonly inch or a little under. Locally softer clsty layers some white (porcellanite?) clsty near top. Conspicuous absence of "rusty bod" sandstone. Slope above cgl ss shows some floetz of bra ss in 1" ledges but contact itself not exposed anywhere. At best the Plainview equivalent here consists of a single thin ledge or two of hard ss. 17