216 REPORT UNITED STATES GEOLOGICAL SUEVEY. 



at Black Buttes station, twelve miles farther up the creek, and also the 

 same as that in the valley of the Yampa. At Point of Rocks it com- 

 prises two layers containing the fossils, separated by 50 feet of strata 

 in which none were found. Only Corbula subundifera White and Cam- 

 peloma vetula Meek & Hay den were found in the lower layer, and the 

 remainder of the following list were obtained froin the upper layer. 



LIST OF LARAMIE FOSSILS COLLECTED AT POINT OF KOCKS STATION, 



WYOMING. 



1. Membranipora ? 



2. Ostrea glabra Meek & Hayden. 



3. Corbicula occidentals Meek & Hayden. 



4. Corbula subundifera White. 



5. Campeloma vetula Meek & Hayden. 



The layers that have furnished the important collections of plant re- 

 mains at Point of Bocks station, which have been described by Mr. Les- 

 quereux, were found to be lower in the Laramie series than those which 

 furnished the fossils of the foregoing list, and they are also below the 

 unconformity that has been referred to. Proceeding up the valley of 

 Bitter Creek the horizon of the invertebrate fossils was once or twice 

 detected by some scattered fragments of oyster-shells, but no impor- 

 tant collections were made until I reached Black Buttes station, some 

 twelve miles to the southeastward. I stopped on the way at the Hall- 

 ville mines where Mr. Meek had formerly obtained some Laramie fos- 

 sils, but as the mines had been abandoned I was unable to make any 

 collections. The strata of the Black Buttes locality were found to 

 contain fossils for a considerable distance both above and below the rail- 

 road station and upon both sides of the creek, the principal locality be- 

 ing about a mile south of the station. 



LIST OF THE LARAMIE FOSSILS COLLECTED AT BLACK BUTTES STA- 

 TION, WYOMING. 



1. Anomia micronema Meek. 



2. Anomia grypliorliynchus Meek. 



3. Ostrea glabra Meek & Hayden. 



4. TJnio couesi White. 



5. TJnio propheticus White. 



6. TJnio aldrichi White. 



7. TJnio proavitus White. 



8. TJnio holmesianus White. 



9. TJnio endlichi White. 



10. TJnio cryptorkynchus White. 



11. TJnio brachyopistlius White. 



12. TJnio goniambonatus White. 



13. TJnio dance Meek & Hayden. 



14. Corbicula occidentalis Meek & Hayden. 



15. Corbicula (Leptestlies) fracta Meek. 



16. Corbula subtrigonalis Meek & Hayden. 



17. Neritina volvilineata White. 



18. Ueritina (Yelatella) baptista White. 



19. Goniobasis gracilienta Meek & Hayden. 



20. Cassiopella turricula White. 



21. Melania wyomingensis Meek. 



22. Viviparus plicapressus White. 



