Mesozoic and Cainozoic Geology and Palceonfology. 63 



2. Dakk Colored Clay. [Position of beds Nos. 2 and 3 of the Ne- 

 braska section.] 



At the present time the evidence tends to show that No. 1 of the 

 Nebraska section is represented by Nos. 1 and 2, and that Nos. 2 and 

 3 of the Nebraska section are wanting, and would find a place between 

 Nos. 2 and 3 of this section if existing. 



This bed contains large quantities of fossil wood (no animal i-emalns 

 are known to occur in it). 



1. Fire Clay and Potter's Clay. 



This bed contains fossil wood, and numerous impressions of leaves; 

 but no animal remains. 



In making the comparison of the strata he placed a large part of the 

 Cretaceous fossils of the boundary survey in the same parallel with beds 

 Nos. 2 and 3 of the Nebraska section, and below those beds in New 

 Jersey' and Alabama, which contain Baculites ovatus, ITautilus dekayi 

 and Ammonites placenta. He described from Leon Springs, Pyrina 

 parry i. 



Prof. T. A. Conrad described, from between El Paso and Fron- 

 tera, TurbinoUa texana^ Cucullcea terminalis. Area subelongata, Car- 

 dium inediale, Cytherea texana, Ostrea vellicata, Nodosaria texaria; 

 from Loon Springs, Trigonia texana, Protocardia filosa, Cardita em- 

 inula, Lima leonensis, Cytherea leonensis. Ammonites geniculatus, A. 

 leonensis, Capsa texana, Terebratida leonensis, Turritella leonensis; 

 from Rio San Pedro, Cardium congesticm, JSTatica collina, JV. texana, 

 liostellaria collina, Buccinopsis x>arryi; from Dry creek, Mexico, Os- 

 trea cortex.^ 0. multilirata; from Turkey creek, Leon and Eagle Pass 

 roads, Pholadomya texana; from Jacun, three miles below Laredo, 

 Ostrea robusta. Ammonites 2>lGurisepta; from other places, Corbula 

 occidentalis, Inoceramus texanus, Astarte texana, Plicatula incongrua, 

 Ostrea bella, 0. lugubris, Turritella planilateris, Nerinea scliotti, and 

 Cardita subtetrica. 



Evans and Shumard* described, from Nebraska, Avicula nebras- 

 cana, Limopsis striato-punctata, Cardium subquadratum, and C. va- 

 rum, now Protocardia sicbquadrata^ and P. rara. Area sulcatina, now 

 Nemodon sulcatinus, Leda fibrosa, no\f JSTecera fibrosa, Ilytilus meeki, 

 now Volsella meeki, Ostrea subtrigonalis^ Pleurotoma minor, Fusus 

 nehrascensis, Turritella multilineata, Rostellaria americana, now An- 

 chura americana, and Ammonites galpini. 



Meek and Haydeuf described, from the Great Bend of the Missouri, 



* Trans. St, Louis Acad. Sci., vol. 1. 

 t Proc. Acad. Nat. Sci-, vol. 9. 



