4G8 



GEOLOGY OF THE BLACK HILLS. 

 CRETACEOUS— Continued. 



Systematic name. 



Gasteropoda— Continued. 



AiKlmra (DropauoclieiluB) nebracensis E. 

 & S. 



Luuatia cuuciuua II. &. M 



Vauikora ambi^ua M. & H 



Aiiiaiin)])si.M ]ialn(liii:i'foriiiis H. &- M 



Margarita lu'brascensis M. & H 



Anisomyou alveolus M. & H 



subovatus M. «& H 



patelliformis M. & H 



borealis Morton 



Akera glansoryza, n. sp 



Haminea Bubcylindrica M. & H 



Dcntaliuui gracile li. & M 



CEPHALOPODA. 



Nautilus dakayi var. montanensis Meok 



Prionocyclus wyomingensis Meek '. 



Scapliitcs nodosus Owen 



var. brevis Meek 



quadraugularis Meek 



pleuus M. «& H , 



warreni M. & H 



wyomingensis M. & H 



Helicoceras stevensoni, n. sp 



Heteroceras newtoni, n. sp 



? nebracensis M. & H 



Ancyloceras jeniiey i, n. sp 



tricostatum, n. sp , 



Ptychocoras moekanmn, u. sp 



crassuni, n. sp 



Division. 



No. 

 4 or 5 



or .5 



Locality. 



East fork of Beaver Creek 



Cheyenne River, near Rapid Creek.. . 



Cheyenne River 



Cheyenne River, near Box ElderCreek. 

 One hundred and fifty miles above 

 mouth of Yellowstone. 



Old Woman Fork 



do 



do 



Cheyenne River 



Cheyenne River, near French Creek.. 



Old Woman's Fork 



Cheyenne River, near Rapid Creek . . . 



Page. 



4-29 



430 

 430 

 431 

 432 



433 

 434 

 435 

 436 

 437 

 437 

 438 



do 439 



East fork of Beaver Creek 440 



Cheyenne River, near Rapid Creek.. . 441 



do I 443 



do I 443 



j 444 



East fork of Beaver Creek 444 



do 446 



W^est of Beaver Creek 447 



do 449 



East fork of Beaver Creek 451 



-do. 



Cheyenne River, near French Creek. 



Beaver Creek 



Old Woman Fork 



452 

 454 

 4.''.7 

 459 



