. Annual report of the United States Geological Survey to the Secretary of the Interior . ards limestone groupis more or less arenaceous. (See PL LIV.) The Comanche Peak limestone does not vary perceptibly, except inthickness, between the Colorado and Brazos rivers. In the ColoradoBasin it is nearly 100 feet thick. On the Brazos River, as exposed inbluffs at the border of the river basin through Hill and Bosque coun-ties and in Comanche Peak, the thickness of the Comanche Peak variesfrom 65 to 70 feet. North of the Brazos it begins to decrease, as pre-viously described, as it passes into the G
. Annual report of the United States Geological Survey to the Secretary of the Interior . ards limestone groupis more or less arenaceous. (See PL LIV.) The Comanche Peak limestone does not vary perceptibly, except inthickness, between the Colorado and Brazos rivers. In the ColoradoBasin it is nearly 100 feet thick. On the Brazos River, as exposed inbluffs at the border of the river basin through Hill and Bosque coun-ties and in Comanche Peak, the thickness of the Comanche Peak variesfrom 65 to 70 feet. North of the Brazos it begins to decrease, as pre-viously described, as it passes into the Goodland limestone. The Comanche Peak formation, especially in its lower part, is veryrich in fossils, a feature which in a degree distinguishes it from theoverlying Edwards limestone. (See PL XXVII.) Dr. B. F. Shumard These are the most conspicuous and abundant species south of theBrazos. Tatf gives the following list from the limestones near Ben-brook, Tarrant County, where a few species occur which have notbeen noted in the southern locality: PALEONTOLOGY OF COMANCHE PEAK Cylindrite* formosus Cragin. Eriallaster texanus. Exogyra texana. Gryphrea marcoui. Diplopodia texanum. Cyprimeria crassa, in the lower part. Schli lenbachia acutoearinata. Sclili priil iacliia elegana shumardi tarrantonsis plexa Cragin. 1 Trans. Acad. Sci. St. Louis, Vol. I, U. S. GEOLOGICAL SURVEY TWENTY -FIRST ANNUAL REPORT PART VII PL. XXVII
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