Field Notebook: CO 1951a
Page 23
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Transcription
1.5' fine sandstone, sandy shale, and minor silty sandstone. 3'+ with underbidded dark sandy shale and fine ss: ss speckled as above, in beds 1/2" to .3 (this shale more locally thicken and less sandy laterally. (see separate section of same) 12.5' ss: fine grained iron speckled, similar to above, less thin bedded than massive beds; end beds up to three feet: poorly undulated weathering to buff. local channelling within unit: concretary iron cemented zone locally present 8-9' feet from top. as above this concretary zone more resistant than those below it [lower 2'] becoming increasingly silty and shaly with few resting layers; grades into underlying unit. Underlying unit is silty to sandy clay grading to finely silty clay: weather (silty upper part) light gray with some iron staining, lower part gray with reddish mottling: may be due to weathering and not original feature. 1.2' gray argillaceous siltstone: weather white with irregular iron stain. 3.3' silty clay: gray to light gray in weather, ed surface; fresh color underneath, some iron stained streaks