MARINE SEDIMENTS OF EASTERN OREGON 227 



have not yet been thoroughly studied, but contain probably 

 Halobia rugosa] Guembel, aud two undetermined species. 



The Jurassic. — Hyatt' described fossils from eastern Oregon 

 which he thought came from Beaver creek, a tributary to 

 Crooked river. The specimens are now in the Condon Museum, 

 University of Oregon, and include, according to Hyatt : 



Pecten acutiplicatus Meek. 

 Pholadoniya nevadana Gabb. 

 Pholadoniya niultilmeata Gabb. 

 Pleuromya concentrica Hyatt. 

 Cardinia gibbosu7n (J) Meek. 

 Rhynchonella sp. 



These fossils did not come from Beaver creek, but from 

 Silver river, over thirty miles east of Beaver creek, where they 

 were found by William Day, of Dayville, Ore. 



Professor Condon has obtained another collection made at 

 Red Butte, Tp. 19 S., R. 30, about twenty miles north of Burns. 

 This collection was sent to him by Mr. A. H. Huntington, of 

 Baker City. It includes : 



Pecten acutiplicatus Meek. 

 Pholadoniya nevadana Gabb. 

 P. multilineata ? Gabb. 

 Entolium meeki Hyatt. 



The third-mentioned form bears some resemblance to P. inaequi- 

 plicata Stanton. There are also some undetermined bivalves and 

 ammonites in the collection. The fauna is that of the Hard- 

 grave sandstone of Taylorville.^ 



Though the fossils studied by Hyatt did not come from 

 Crooked river, it is probable that the Jurassic does occur there. 

 In 1862 Professor Condon picked up a few shells on lower 

 Beaver creek that seem to belong to that period. Mr. Stanton 

 says of them : 



The fossils from Beaver creek include a Gryphea, two casts of an Ostrea, 

 a Pecten, and probably two s^e.c\es oi Rhynchonella related to R.gnathophora 

 Meek. I am unable to give specific identification of any of the forms, and 

 they do not give any certain indication of the horizon from which they came. 



' Bull. Geol. Soc.Am., Vol. V, pp. 401, 418-20. 

 "^ Bull. Geol. Soc. Am., Vol. V, p. 401. 



