Field Notebook: Texas 1957a
Page 236
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Transcription
in place. If the fusulines are Gaptank in age then I believe it is safe to consider this outcrop in place. More than 5'. Collection 7/16/57/1 [Leonard Sch. crastictoria] 1-64 C.R. check sample?? 2) Covered 83'. 3) Shale, light gray (impart covered), 7 or 8-2" to 3" sand and silty sand (Quartz) bands scattered in upper half of unit; 28'. 7/16/57/2. 4) Sandstone, orange-brown weathering, medium quartz sand, with silt fragments of pebble (1/4 to 1/2" diameter) Brachiopods, crinoid stems, goniatites wood fragments. 2'. PG. 102 5) Shale, gray to bluish or greenish-gray, 4 or 5-1" very fine sandstone bands, 10'. 6) Sandstone, orange-brown weathering, fine quartz sand size with calcareous cement. A few wood fragments. The lower 1' of this unit is light green-gray weathering, sand size is the same, difference seems to be the amount of Iron Oxide with the CaCO3 cement. 8'. 7) Shale, greenish-gray, a few 1/2" of sand of siltstone horizon. (7/16/57/3) 27'. 8) Sandstone, orange-brown weathering, very fine sand size much silt --> 30% brachiopods, wood, crinoid stems, 2 to 3" beds 3'. 9) Like 7 in lower part, gradually, upwards, the lithology of unit 8 becomes dominant, beds 3" to 4" is the sandstone: 46'. 10) Sandstone, light brown weathering, (3' of gradational beds at base to this unit into the blue-gray shale at top of #11. 6" to 2' bedding: 19'. PG. 103 {note: illustration: bed 1: 7/16/57/1 bed 3: 7/16/57/2 bed 7: 7/16/57/3 bed 11: 7/16/57/6 bed 12: 7/16/57/4 bed 14: 7/16/57/5} 11) Covered 23', probably blue-gray shale with possibly one limestone bed 8' uneven nodular bedding surfaces. Fusulines, bryozoan, crinoid hash. Collection 7/16/57/6. 12) Limestone, gray weathering, massive beds, blocks weather rounded, (not angular). This unit has wavy bedding surfaces and seems to represent a fore reef accumulation of dumped debris 6" to 8" beds. 7/16/57/4. 32'. 13) Covered 8' probably same as 12. 14) Limestone, light brown weathering, cliff forms 2' to 15' beds, massive weathering as a unit along most of this ridge. 53' to top of ridge. PG. 104