. Annual report of the United States Geological Survey to the Secretary of the Interior . dingly fine, and is usually so mixed with clay as tobe almost imperceptible. There are a few very fine pebbles of jasperand quartz in the upper part of the formation embedded in the whole weathers into a sticky black sandy soil. This formation hasits greatest development in Navarro County, making a north-southbelt through the county. Its eastern edge extends from RichlandCreek 1 mile above the mouth of Pine Creek, through the town ofCorsicana, to a point 4 miles east of Chatfield, and averages ab
. Annual report of the United States Geological Survey to the Secretary of the Interior . dingly fine, and is usually so mixed with clay as tobe almost imperceptible. There are a few very fine pebbles of jasperand quartz in the upper part of the formation embedded in the whole weathers into a sticky black sandy soil. This formation hasits greatest development in Navarro County, making a north-southbelt through the county. Its eastern edge extends from RichlandCreek 1 mile above the mouth of Pine Creek, through the town ofCorsicana, to a point 4 miles east of Chatfield, and averages about .>miles in width. From Chambers Creek, just northeast of Corsicana, to Chatfield aband of calcareous limestone only a few feet thick, with Osbrea/tin//<_/,/</, occurs in the Navarro formation. Near Chatfield, in NavarroCounty, the limestone concretions of the Corsicana beds contain beau-tiful fossils preserving their nacreous colors. Sandy clays similar to the Corsicana beds are traceable south through U. S. GEOLOGICAL SURVEY TWENTY-FIRST ANNUAL REPORT PART VII PL, XLVIII. CHARACTERISTIC FOSSILS OF THE TAYLOR AND NAVARRO FORMATIONS. I, 1(1, Venilla lineata Shumard; 2, Pregnellus densatus Comad ; 3, Turritella trilineata Conrad ; 4, Sphenodiscus lenticu-laris?Meek; 5, Pachycardium spillmani Conrad ; 5(1,6, Ostrea larva Lamarck. / I *,T* ^LL/NO/S HILL.] CLAYS AT KEMP. 343 Navarro, Limestone, and Falls counties to Brazos River, their easternmargin passing just west of Tehuaeana. In this area, as already stated, it is impossible to differentiate thepartings between the Navarro beds and Taylor marls, inasmuch asthey grade into each other and their parting is mantled by thick well sections at Corsicana (see PI. LX1X, p) penetrated 1,200 feetof blue clays representing these two divisions, which show little or nodifferentiation. A similar thickness is indicated by the Terrell this general region it is also very difficult to distinguish the upper-most Cret
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