Field Notebook: Texas 1957b
Page 161
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Transcription
40 50yds westy section 29; an a stream cut a 9' limestone underlies the Calcarudite. Short seems the calcarudite has been deposited on a eroded surface of the ls. 6) A, ls, [illegible] light pink; massive, weathered surface has a tingly brownish orange 0' to 9' 8/17/57/3 6) B, ls, light gray, some yellows; calcarenite 6"-8" beds, Coel. 8/17/57/2; 0'-20' These 2 units overlie 6) and underlye 7) w Top of Ridge About 4' of straight relief I think the Calcarudite is wave reworked material, not much transporty the Chertsgoes, but most of the ls have probably been reworked nearly endsee. Beds 6A and 6B weather into horizontal wavvy "bedding" lines; these I have call debris beds off reef highs and I suppose that would hold true too. I believe the Hess Cycle has been reported on the Lower beds westward to the Brooks Ranch-explains Lackysg The beds above the Hess Calcarudite are -shaly & silty for a considerable distance upwards. They then begin to alternate in some sort of cyclic deposition. 4 to 6 cycles of Hesse cycle before the ridge forming dolostone (41s) unit is reached. The Hess Cycle usually has a red shale I suppose you either see or at top in the eastern portion of Moore Ranch - In fact in the middle-western exposures also. The first canyon east of the ranch road thru the Wolfcanyon, has 4 or 5 Hess Cycles separated by red shale and buff sandstones. The Hess is about '75' to 80' thick here. The Wolfcanyon, thicker here and the gapland ls (#5?) is well exposed. The size of the gapland & Wolfcanyn increases. 41