Field Notebook: SD, CO, WY 1967
Page 43
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Transcription
Capped by 6" to 1' conc. sand which has irreg. contact with set beneath, bottom shows trails (or) is very lam to ripple lzm. sand. Low, vent burrows indet. Some impressions ophiio on underside. Rippled surface for an crp. current ind. loc from NNE Loc in sand inclusions in layers + blebs of porcellanite. Unit 8 +21°, 25' Sand, as below, conc. laminated sand layer about in middle, and at top Mid layer locally shot with fusiform holes which weather out to funnel-like holes on outcrop. 15' Upper (layer rippled) + commonly capped by conspicuous current ripples. Soft beds between 2ft fq sand - clay with fl lam. more conspicuous than in unit 7 but locally x-lam. Most of this interval obscured. Burrowing chiefly in 2 conc layers apparently 19