4 PKOCEEDINGS OF THE JSTATIONAL MUSEUM vol. 78 



limestone and beds of carbonaceous material, and yielding a large 

 fauna of chiefly nonmarine sj)ecies, together with a few marine forms 

 that indicate Upper Cretaceous age.® Above the Aspen shale lies 

 conformably the Frontier formation,^ a group of sandstones inclosing 

 irhales and beds of coal, the whole several thousand feet thick. Parts 

 of the formation have jdelded a marine fauna which includes the 

 following species as identified by T. W. Stanton: Barhatia species, 

 Inoceramus labiatus Schlotheim, /. aff. /, erectus Meek, Pteria 

 species, Ostrea soleniscus Meek, 0. sannionis White, Lima species, 

 Anomia species, Anatina species, Modiola species, Pholadomya 

 h-pecies, Cardium curium Meek and Hay den, O. fawperculum Meek?, 

 Tellina modesta Meek, T. (f) isonema Meek, Donax cuneata Stan- 

 ton, Mactra emmonsi Meek, Gorbula inematophora Meek, Gyrodes 

 species, Turritella species, Glauconia coalville7isls Meek, Pugnellus 

 fusiforinis (Meek), Fusus utahensis Meek?, Admetopsis subfusl- 

 formis Meek. 



THE ASPEN FAUNA AND ITS RELATIONS 



As noted previously there have been reported from the Aspen 

 formation to date only scales and other remains of fishes, Metoico- 

 ceras species and Lingula species. To these the present paper adds : 



Pteria {Oxytoma) species. 



Ostrea species. 



Anomia species. 



Periflomyaf aspenana Reeside and Weymouth, new species. 



Thracia? wyoniingensis Reeside and Weymouth, new species. 



Tancrcdiaf lincolniana Reeside and Weymouth, new species. 



ApJiTodina? aspenana Reeside and Weymouth, new species. 



Linearia? species. 



Tellina? species. 



Mactra? incompta (White) ? 



Mactra? aspenana Reeside and Weymouth, new species. 



Kanahiceras wyonningense Reeside and Weymouth, new genus and 

 species. 



Epengonoceras aspenanum Reeside and Weymouth, new species. 



Metoicoceras whitei Hyatt. 



Metoicoceras species. 



Acompsoceras americanum Reeside and Weymouth, new species. 



8 White, C. A., The Bear River formation and its characteristic fauna : U. S. Geol. Sur- 

 vey Bull. 128, 1805. A. C. Veatch, U. S. Geol. Survey, Brof Paper 50, pp. 60-64. 

 Veatch, A. C, U. S. Geol. Survey, Prof. Paper 56, pp. 65-69. 



