Field Notebook: Texas 1957a
Page 252
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Transcription
33) Siltstone, very limy, light brown to brown-gray weathering. 34) Sandstone and siltstone, sandstones very fine grained grades into a 1' to 1.5' lime rich resistant beds. [8']. 35) Sandstone, very fine grained, light brown weathering up to 1" bedding - 23'. 36) Covered, 5'. 37) Sand as #35 - 8'. 38) Limestone, gray weathering 8", has a little cephalopod in it. 7/20/57/6. 39) Sandstone, very fine grained, light brown weathering 8'. 40) Limestone, Massive, gray weathering, biohermal, Upper Hess Ledge. PG. 127 {note: illustration: bed 38: 7/20/57/6 bed 40: 7/20/57/7} Collection 7/20/57/7 - a piece of float, found at about bed 34 - it is a gray limestone so is either from about #38 or, most likely from #40. Upperpart, through bed 29, of this section the sequence of lithology is rather cyclic, even the Hess (?) in it upper part shows cyclic deposition but with the change of either source of sediment or of depositional environment. I frankly don't know exactly where to draw the Wolfcamp Conglomerate, the bed #2 limestone I believe is equal to the lower Hess ledge. King calls the lower limestone ledge Hess, and the upper ledge, the first Leonard limestone member. Section 18 thus includes Wolfcamp (part), Hess, and lower Leonard brachs. PG. 128 7/21/57 Section 19 - up to eastern most cliff forming Wolfcamp Conglomerate - topped by Hess limestone ledge. Decie Ranch. The lower part of this section is covered and it is jumbled up. no dip 0) Covered below 1) Sandstones, green-gray weathering, much green silty material, 6", Collection 7/21/57/1. 2) Conglomerate, brown weathering, mostly 1/4" to 1/2" chert pebbles, brown sand, but few crinoid stem fragments, 5', 7/21/57/2; 2" to 6" beds. 3) Covered, 10'. 4) Limestone, medium gray weathering, biohermal, no definite bedding, large cephalopods, crinoid columns, fusuline (very large for Penn., could they be Pm?) brachiopods - 29'. Collection 7/21/57/3. (Rained out) {note: illustration: bed 1: 7/21/57/1 bed 2: 7/21/57/2 bed 4: 7/21/57/3; 7/29/58/1; 7/22/57/1}