REVIEW OF PREVIOUS WORK 451 



were separated I'rum his Fayette and added to Ins Marine beds under 

 the name of Ye^ia clays. ^-' 



During 1892-1893 Harris studied the gTeat mass of Tertiary inverte- 

 brate material that had been collected by various members of the Texas 

 Survey and prepared a report on it^^ that would liave been of gi'catest 

 value to all workers in Tertiary geology. Unfortunately a wave of econ- 

 omy struck the State administration about that time, and, together with 

 the other papers which were to make up the Fifth Annual Eeport, its 

 publication was held up. Fortunately he had made a very complete 

 catalogue of species and localities, and this is preserved at the University 

 of Texas. 



The collections made by Penrose and Bumble from the Fayette sands, 

 exposed on the Eio Grande between Zapata (Carrizo) and the northern 

 line of Starr County, were studied and the following forms determined :" 



Ontrca alnhnmUnHift var. contractu Volutilithes petrosa 



Con. Pscudoliva vetusta 



Anomia ephippioidcs Gabb Pscudoliva vetusta var. pica 



Pcctcn sp. a Pscudoliva vetusta var. fusiformis 



Lcda opulent a Lcvifusus tfabeatoides 



Venencardia planicosta Lam. Cornulina armigera 



Crassatella protexta Turritclla nasuta 



Ciitherea sp. a Turritclla nasuta var. houstonia 



I'ijthereu bastropensis Har. Natwa sp- b 



Tellina sp. Natica .sp. c 



TelUna moorcana Natica rccurva var. dumhlci 



Scmcle liHttsd Lacinca alvcata 



Volutilithes sp. Conus sauridcns 



Xo fossils except oysters were found in the upper portion of the section 

 lying between tlie Starr County line and Eoma, and it was in this stretch 

 that all of the larger oysters were found. The lower beds, between Zapata 

 and the Starr County line, which furnished all the other species of fossils, 

 carried oidy medium-sized oysters, althongh they were identified as be- 

 longing to same species. 



The abundance of inxci'lchratr lussiis in this region is in striking von- 

 trast to thr cninliiions on llic Colorado, where only plant remains have 

 been observed. 



The section on the Nueces River showed the Fayette sands overlying 

 the Yegna ehiys and o\ei-!ain by a body of dai'k-colored calcareous clays, 

 which were caileil the Vy\o clavs. 



'= Hrown : Coal and liKnil*'. P- 1-18. 



'■' Ilai-fis : Manuscript record of Tertiary fossils. 



'* Harris : Manuscrii)t record of Tertiary fossils. 



