Bulletin of the United States Geological Survey--Reconnaissance of the Rio Grande Coal Fields of Texas . ighteenth Ann. Rept. D. S. Geol. survey, Part II, 1898, pp. 240, 241. 32 RIO GRANDE COAL FIELDS OF TEXAS. | BULL. 1W. II. Anacacho formation—Continued. Feet. 2. Soft material containing fragments of a very large Inoceramus 5 1. Thin, very hard, brown, siliceous ledge 3 or 4 beds. 279 Total AnacachoI. Austin chalk: 3. Hard brownish limestone, containing many Grypluva aucella 5 2. Hard chalky limestone 10 1. Unexposed—to bottom of arroyo 20 Total Austin chalk exposed 35 Total Anacacho beds ,
Bulletin of the United States Geological Survey--Reconnaissance of the Rio Grande Coal Fields of Texas . ighteenth Ann. Rept. D. S. Geol. survey, Part II, 1898, pp. 240, 241. 32 RIO GRANDE COAL FIELDS OF TEXAS. | BULL. 1W. II. Anacacho formation—Continued. Feet. 2. Soft material containing fragments of a very large Inoceramus 5 1. Thin, very hard, brown, siliceous ledge 3 or 4 beds. 279 Total AnacachoI. Austin chalk: 3. Hard brownish limestone, containing many Grypluva aucella 5 2. Hard chalky limestone 10 1. Unexposed—to bottom of arroyo 20 Total Austin chalk exposed 35 Total Anacacho beds , 279 Total here exposed 314 The measurements were made with an aneroid barometer and must be regardedas only approximately correct. The deposit of asphalt at the Lithocarbon Rubber Companys mine is in theAnacacho limestone. The asphalt-bearing horizon corresponds with the upper partof No. 6, above. The following is a compilation from a large number of sectionsmade along Turkey Creek, beginning at Cline Mountain, in the Brack- ett quadrangle, and extending to d/ectryosj/s. Gryphaaa ises/cu/a/79 us. Wagon Top Butte, in the Uvaldequadrangle, (ompilation of 20. sectionsCreek. along Turkey Feet. 19. 18. Hard gray limestone. Thislime-stone is coarsely granular, loosetextured, and possesses a veryrough, honeycombed, weath-ered surface. It contains anundetermined species of Radi-olites or Sphserulites 10 Thinly laminated, hard or marlylimestone 20 Ledges of gray limestone, withhoneycombed surface, but notso hard as the uppermost lime-stone. This bed is not wellexposed, so that its detail couldnot be determined 30 Hard, dark-brown, granularlimestone 3 Light-colored, yellowish, granu-lar limestone in hard, thickledges. This bed containsspecimens of a large Exogyraand a Radiolite; also somepebbles of white and yellow quartz 7 15. Thinly bedded limestone, becoming a thinly laminated, firm, calcareous shale. 1514. Laminated yellow calcareous marl 50 16 Fig. 4. -Section of the Anacacho Mo
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