Field Notebook: Texas 1957b
Page 159
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Transcription
(38) 'ell. 8/16/57/11 -- from 10' interval. limey beds below crossed Uddistics Sandstone Horizon in 2nd Section of Black Eg Geol Canyon. The lower part of the cyclic beds are exposed to the easty Geological Canyon about like the #21s mile. There seems to be similar stricture (at least for this area) as the #2 beds taken suddenly beneath the cyclic beds. The shale interval here is a light gray and less shaly silty. This of these cyclic calcareous sand are present. The bulk of the material is a coarse rubble and includes darkgray ls pebbles 2-3" diams and glass mattled occaulty appearance on all. I don't see how all of the stricture here can be attributed to dragging over buried reefs although that is still within possibility. The explanation goa SW-NE structure trend as appealing. These beds seem to be faulted in the 15 units and flows into shale but no definite such structures were observed. 36 8/17/57 Section 29: Moore Ranch; 200gds east of last Wolffs #1s exposure 1) Covered, probably siltstone and shales, base grain under alluvions 2) Sandstone, light green gray to brownish orange, vs grain quartz for most part; occasional conglomeratic beds. 4' 3) LS, green gray, fragmental calcite, these are in a limey shale matrix and are similar to the #3 bed section 23. 27' 4) Covered, 11' (same as #3 m stream cut) (but considerably more 8/17/57/4) 5) Sandstone, weather orange-brown; fresh is green gray; vs to fine grain gray; 1 1/2' 6) Covered, 15' 7) Calcarenite; light gray to brown gray weathering. up to 6" cobbley, very small amounts of chert. (8/17/57/1- pebbles) 15' to top of ridge, this unit forms dip slope here. (39)