Field Notebook: CO, WY 1955b
Page 9
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Transcription
conspicuous cap on ss below. B (9) 4.5 Shale, dk gray to black and shelly siltst, dk gray wezths light blue gray, some interbeds fine qr ss. Partially observed Siltst predominates except in lower 1.5 where 2 beds bl. sl. and silt lb ss. This unit changes from silty to sandy in upper 1.5+ and grades into ss above (10) 7.9 Chiefly friable, evenbedded buff wezth ss in beds 0.1 to 0.6 capped by more resistant bed 1/3. All finegr, silty in lower part where it grades to unit below. (11) 3.8 Shale fissile black, siltier tgray above, 0.5 bl. slty siltstone at top, lb orgill ss in lower foot. (12) 3.1 slightly silty. Shale, black fissile, with 0.2-0.3 porcelenite at top and thin one at base.