. Annual report of the United States Geological Survey to the Secretary of the Interior . r occurs just in the east bluffs of Syca-more Creek, TO feet above its bed, at an altitude of about 750 the beds of the Trinity division between the Paleozoic floor belowand the Fredericksburg limestone at the top of the plateau have a totalthickness of -198 feet, as shown in the following general section nearthe mouth of Hickory Creek. (See PI. XX, A, and section No. 6,p. 141.) Section No. 4.—Near mouth of Hickory Creek. Fredericksburg division:Edwards limestone .Walnut beds Trinity division:Gl
. Annual report of the United States Geological Survey to the Secretary of the Interior . r occurs just in the east bluffs of Syca-more Creek, TO feet above its bed, at an altitude of about 750 the beds of the Trinity division between the Paleozoic floor belowand the Fredericksburg limestone at the top of the plateau have a totalthickness of -198 feet, as shown in the following general section nearthe mouth of Hickory Creek. (See PI. XX, A, and section No. 6,p. 141.) Section No. 4.—Near mouth of Hickory Creek. Fredericksburg division:Edwards limestone .Walnut beds Trinity division:Glen Rose beds. Alternations of thin limestones, clays, and sandy Peak beds Paleozoic: Carboniferous clays and sandstones Thickness. Feet. 7010 80 235263 498100 Total depthto bottom ofstratum. Feet. 80 578678 The town of Burnet is 15 miles west of north of the latter localityand is some 500 feet higher in altitude. Here, in the head of Hamilton Fredericksburg division Vicarya bed. Basal conglomerate Paleozoic limestone. Fig. 10.—Section of Post Mountain, Burnet County, Texas. Creek, from 1 to 2 miles south of the city, the Basement Cretaceousbeds, similar to those at Sycamore Creek, can be seen in contact withlimestones of supposed Silurian age (Burnet marble). These sands 136 BLACK AND GRAND PRAIRIES, TEXAS. consist of ;i coarse grit or small conglomerate a few feet in thickness,surmounted by red arenaceous clajS, and are covered by the typicalWestern Cross Timber forest. They occur at an altitude of 1,250feet. Less than a mile to the west the Basement beds may be seen atan altitude of 1,400 feet, in the slopes of Post Mountain, resting uponthe Burnet marble. The following section shows the relations of the Cretaceous forma-tions in this mountain: Section No. 5.—Post Mountain, 1 mile west of Burnet. (See fig. 10.) Total depth Thickness. to bottom of stratum. Fredericksburg division: Feet. Feet. 5. Barren Edwards limestone and Comanche Peak lime- stone 95 4. Wal
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