Field Notebook: Texas 1957a
Page 130
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Transcription
120 6 7/20/57 Deer Ranch SW end of hills Section 18- 1) Conglo, baxly caved. have a Caly Flag and Gyp pebbles, gray var matrix, a small amount cement, Ca CO3 cement. Not knowing if the dips are significant, level level up through the conglo beds. This unit is in part covered, but the conglomerate are coarse and are the only outcropping rocks- 55' Cobble of Conglo-Collector 7/20/57/10 3) Covered 4'; 2) LS, gray sandstone, some minor amounts of fragments of chert, dip about 10°WNE. Grain within this LS unit are quite conglomerate. The chief distinction between these #2 and ls sand is the matrix. The conglomeration petrified in about 7', but r.f. pebbles are present in the 15 higher in this unit. Top of unit is very silicous, well sorted from a 1" plate. Bedding-below is 1' to 4'; 52' This unit is also equal to lower Hess ledge. 4) Siltestone vs sandstone silicon cement Can vary but often irregular texture; Silicon cement is 2ndary see 7/20/57/1 11' 5) LS, clastic, with ched pebble 1', thm to NE. thickers to SE 6) like #4 5' 7) like #5, 1 1/2', thicker to SE 8) like #4 6' 9) LS, clastic, 3 beds 4" to 8" thick, each with well sorted flat tops, separated by siltstone; 3' 7/20/57/9