REVIEW OF PREVIOUS WORK 453 



sands is now restricted (jvist as we have restricted the name Fayette 

 sands to those of the typical Colorado and Eio Grande sections), are of 

 Oligocene age, and therefore are not represented by either the Fayette, 

 the Oakville, or the Lapara sands. It is true that there are points of 

 resemblance in these sands to those of the Grand Gulf, especially in the 

 quartzitic beds and the opaline cement, besides which the Fayette, in 

 places, carries some plant remains. 



In the Nueces section the Oakville includes a body of brown sands at 

 its base in which no fossils were found, and it was recognized that further 

 study might necessitate a separation of this from the upper fossiliferous 

 beds;^® but, so far as is now known, there is nothing to indicate its con- 

 nection with the Grand Gulf or Catahoula or to remove it from the 

 Miocene. 



The physical conditions on the Eio Granele and Nueces appear to ex- 

 tend eastward to the San Antonio River. East of that stream the Frio 

 gradually becomes thinner, and is almost, if not entirely, lacking on the 

 Colorado. Both the Fayette and Oakville show a greater admixture of 

 clay, and the invertebrate fossils so abundant on the Rio Grande seem 

 entirely wanting and are replaced by fossil plants. 



East of the Colorado the difference is even more marked. 



In 1891 a few imperfect casts of fossils were found at what was sup- 

 posed to be the base of the Fayette sands,^'^ near Sunnyside, in Lee County. 

 Later better specimens were found, and Harris determined them as 

 follows : 



Ceronia singleyi Pleurotoma moorei var. g 



Paphia ~ 



Kennedy, in his East Texas sections,^^ describes the sands in the vicinity 

 of Corrigan and Rockland. In a railroad cut 4 miles north of Corrigan 

 he collected the following forms from the base of these sands :^^ 



Dcntalium microstriatum var. dumblei Pleurotoma quassalis 



Venerwardia planicosta Turhonella sp. 



Cytherea texacola var. tornadonis Lcvifusus trabeatoides 



Corhnla alabamiensis Cancellaria penrosei 

 Cah/ptraphorus velatus 



These sands carried opalized Avood similar to that of the Fayette west 

 of the Brazos and showed similar quartzitic masses. They were referred 

 to the Fayette. 



" Diimblp : GpoI. S. W. Tex. Trans. A. I. M. R., vol. S."^, p. 076. 



"Third .\nn. Hept. Geol. Surv. Texas, p. xxiii. 



" Kenned.v : Third Ann. Rept. Geol. Surv. Texas, p. 115. 



** Harris : Manuscript record Tertiary fossils. 



XXXV — Bull. Geol. Soc. Am., Vol. 26, 1014 



