Field Notebook: Texas 1957a
Page 224
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Transcription
10) Limestone, blue-gray, sort of rubble, but almost a calcarudite. Darker "pebbles" are in a lighter matrix, but the difference seems to be one is reticular around the other, not good pebbles. 22', 1" to 8" beds 7/10/57/11. [burrowed??] [weathered??] PG. 82 {note: illustration: bed 10: 7/10/57/11 bed 13: 7/10/57/8 bed 17: 7/10/57/12 bed 19: 7/10/57/13} 11) Limestone, light gray weathering, massive, fine grained, 11'. 12) Limestone, shell hash, weathered mottled gray and brown, crinoids, bryozoans, a few brachs, 1/4" to 6" beds. A few inches of shale at the base of this unit. Top of unit has brown weathering color characteristic of the middle an upper Wolfcamp cycles. 15'. 13) Shales in lower part (5' to 7'), becoming more silty and sandy, fusulinid sandstones in upper 2' to 3', 1' shell hash. Collection 7/10/57/8 see note on picture p. 79, 18'. PG. 83 Between unit 12 and 13 slicken-side surfaces were seen cutting the down dip exposures of bed 12, no major displacement has taken place, but this seem rather to be the adjustment to a slight Post Hess warping forming a gentle syncline near the tank. 14) Calcarenite, yellow to orange-brown weathering quite quartz, rich and might be best considered as a quartz sandstone. 2.5'. 15) Cycle - a) 4' gray shale b) 1' like #4 below (at top) 16) Gray shale 9'. 17) Sandstone yellow weathering, 1' beds on less; 16' The fine sandstones have a great deal up to 40 or 50% fusulines, crinoids, gastropods, 7/10/57/12. 18) Covered, probably continuation of 17. [15'?] 19) Limestone, weathers gray to brownish-gray, shell hash, brachs, some fusulines. [12'?] 7/10/57/13. PG. 84 20) like #19, 7'. 21) Sandstone, very fine high CaCO3 4' greenish-yellow. 22) like #19, 21'; changes to dolomite along outcrop (100'). Although no Conglomerate beds were found, I believe beds 19-22 are in the same interval as the "Hess" Conglomerate of section 10. [probably a matter of pre-Hess topographic relief.]