1895.] NATURAL, SCIENCES OF PHILADELPHIA. 131 



5. Dark blue laminated clay 6 to 8 feet 



6. Brown coal in river 4 feet 



This bluff extends up the river for nearly a mile and is from 



twenty to twenty-five feet high. The fossils are plentiful and well 

 preserved, although not so easily obtained as at Moseley's Ferry. 

 Pecten deshayesii is particularly plentiful, in some portions forming 

 solid masses from four to six inches thick for considerable distances. 



From here to the base of the beds at the railway bridge no fos- 

 sils have been obtained. 



The similarity of the structure of these beds and their contained 

 fauna from the Angelina River on the east to the Brazos on the west, 

 as well as the several isolated exposures lying in the counties east of 

 the former, mark a continuity extending clear across east Texas. 

 These beds are also well marked to the west of the Brazos and at 

 Smithville, on the Colorado, we find another great assemblage of 

 fossils, the greater number of which are identical with those found 

 on the Brazos and Wheelock. It may, however, be remarked that 

 so far as numbers of several of the specimens are concerned many 

 of the species show considerable differences. Thus, Conns 

 sauridens, although scarcely represented at any locality east of the 

 Trinity becomes very prolific at Moseley's Ferry, on the Brazos. 

 The same may also be said of Pecten deshayesii, which, though num- 

 erous at Collier's Ferry on that river is scarce in the east. On the 

 other hand Plicatula filamentosa and Spirorbis leptostoma are abund- 

 ant in Hurricane Bayou and at Alabama Bluff, although extremely 

 few of these have been obtained anywhere else. 



The correlation of these beds with the Lisbon stage of the Lower 

 Claiborne of the Alabama section appears to rest upon several 

 grounds. First, their stratigraphic position. In both States they 

 rest upon the lignitic. It is true the Buhrstone of the Alabama 

 section intervening between the Lisbon and Lignitic is absent in 

 Texas. Both comprise a series of highly fbssiliferous sandy and 

 clayey strata with glauconitic green sand and sands containing 

 streaks and nodules of calcareous matter, much of which is badly 

 weathered. Some of the beds are indurated into hard ledges of 

 brown or yellow sandstones, but brownish-greenish and bluish-green 

 soft sands and plastic clays form the great bulk of the deposits. The 

 presence of small beds and deposits of lignite and lignitic strata at 

 irregular intervals in the Texas beds marks the most prominent dif- 



