Field Notebook: Texas 1957b
Page 9
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Transcription
1) Gaptank below is nearly vertical and strikes approximately S45°W. Here it is a reddish to yellowish-brown with a high % of CaCO3, mostly sandstone, some shale and siltstone. 2) Covered 13'. 3) Limestone, reddish-brown weathering, very sandy (very fine sand, quartz) high porosity, has specks of dark material dispersed, 1mm or less in size. 5'. 8/5/57/1. 4) Covered 7', probably much like #3. 5) Calcarenite, medium gray weathering, medium sand size. No identifiable fossils. 2.5' (a few crinoid columns). 6) Covered 2'. 7) Limestone, brownish-gray weathering, very silty, upper 2" are intraformational conglomerate. 1.5'. 8) Covered 4'. PG. 6 9) Limestone, medium gray weathering, a fusuline limestone. 8/5/57/2; 3'. 10) Covered, 3'. 11) Limestone, light gray, fine grained with fusuline. 1' to 3' beds, 8', 8/5/57/3. This unit has a vertical (weathering) fracture. 12) Covered 2'. 13) Limestone, light gray like #11, but more abundant fusulines. 8/5/57/4, 6'. 14) Limestone, light yellow-brown weathering, very sandy and silty; beds 6" to 3', 12' total. 15) Limestone, medium to dark gray, very fine grain CaCO3, a calcarudite, upwards gets mottled brown from siliceous silts, 7'. 8/5/57/5. PG. 7 16) Limestone, light gray, dense, vertical fracturing to weathering, a calcilitute, 19', in bed 8" to 2.5' - Collection 8/5/57/6. Lenox Hills Fm '95. 17) Calcarudite; massive, 3' blocks in it, mostly has of those lithologies #2-16 but a few Gaptank types. Top is nearly flat, has some rubble marks, a dark brown silica rich surface, 22'. 18) Sandstone, light brown, very silt rich in laminate of 1/16" or less, variable thickness, about 5' here. 19) Limestone, medium-dark gray, massive, has just about every thing mentionable in it. Biohermal, 35' top of unit has fault, siliceous surface. Collection 8/5/57/7, 1' below top. 20) Like #18, 3'. 21) Limestone, conglomeratic near base, biohermal near top, yellow or tan-gray, top is flat with 2" band on dark brown siliceous cap; total 4'. PG. 8 22) Limestone, brownish-gray weathering, calcarenite and fine calcarudite. 1' to top of ridge (knoll). Collection 8/5/57/8 on top of ridge.