Field Notebook: CO 1951a
Page 37
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Transcription
forsets indicating W to E (Attitude on foresets, N 45 W, 52°W overturned), Send grams well rounded. 1st ss ← Discount Yan B 8.2 Clay weathering slightly blue gray, fresh it is typical dk gray plastic. BREAKDOWN - 3.2 - Clay, dk gray, .5 Ft stained zone top. 1.5 - Clay with interbeds siltstone up to .1 thick. 3.2 - Clay, dk gray, .1 Bentonitic? zone at base .3 - Siltstone. 10.± Sandstone, hard fine grained, beds chiefly .5 to 1.5 with thin laminated ill bedding, some silty laminae or partings, light gray weathering. ← Discount 7.0 Silty channel clay and argillaceous siltstone dk gray & brown gray, weak shale weathers light blue-gray, siltstone light gray. Siltstone in beds up to 1.0 thick, lensicular, cheery in upper part. Thin beds siltstone ± 0.1 in lower part, about .5 of siltstone at base. 16.0± Siltstone, fine grained thin bedded (.1 to 1.0) cross bedding notable within channels that intersect. Siltstone beds in UPPER part men grade into fat silty shale laterally to thin this unit & increase shale unit above some resistant ledges fine SS chiefly in lower part. local discount 7.6 Clay shaly, weathering fissile with scattered beds thin (up to 1 ft) siltstone (clayey) 16