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pg 124: Geography and geology of the Black and Grand prairies, Texas, with detailed descriptions of the Cretaceous formations and special reference to artesian waters Publication 4171875.

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c, d. Duck Creek formation: Feet. The above limestones grade down into marls with occasional bands of limestone which contain Pachydiscus brazoensis. The exact thickness of the latter has not been ascertained, but they are in the neighborhood of 25 feet, and represent the upper part of the Duck Creek beds. d. 2 White, compact, chalky limestone, containing very many large specimens of Pachydiscus brazoensis, Hamites fremonti and Inocera-mus comancheanus 15 c. 1 Hard and marly limestone, in bands from a few inches to 1 foot in thickness 12 27 Kiamitia formation: Marly clays, with thin alternations of limestone. In the upper part of strata there are Schloenbachia leonensis, Terebratula wacoensis, S. acuto-carinata, and Exogyra plexa. The Exogyra plexa and S. acuto-carinata are found in the basal 4 or 5 feet of the rock 30 FREDERICKSBURG DIVISION. Goodland limestone, as seen in the western part of Tarrant County: Crumbling chalky limestone, with characteristic fossils 18 Alternate strata of soft, massive white limestone and shelly limestones 36 Walnut formation: Alternations of soft shelly limestone and argillaceous lime marl in strata of 5 to 6 inches each 14 Massive limestone 8 Alternations of compact and shaly limestone 68 Agglomerates of Gryphaea marcoui, with thin separation layers of marl 50 TRINITY DIVISION. 130 (For minute details see Weatherford section, p. 190.) 3. Paluxy sands: Light-colored pack sands, with occasional thin clay laminae and logs of silicified wood covered with a growth of post-oak forest, constituting the upper belt of the Upper Cross Timbers. Exposed in the western suburb of Weatherford �110 2. Glen Rose beds: Alternations of limestone, marl, and sand, the limestone usually occurring in hard subcrystalline dimension layers, exposed between Lambert and a point 2 miles west of Weatherford �300 1. Basement sands: Fine siliceous conglomerate and white pack sand, exposed in western Parker County, typical on the east side of Grindstone Creek. Thickness 115

SECTION NO. 3.-AUSTIN OR COLORADO RIVER SECTION.


This section is exposed adjacent to the Colorado River in its course through eastern Burnet and Travis counties. It reveals the entire thickness of the Cretaceous, with the exception perhaps of a few feet of the uppermost beds, which are overlapped by the Eocene.

 

 

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