FOX HILLS AND LOWER MEDICINE BOW 15 



Coal bed ^ 



Shale, gray, sandy ^ 



Fox Hills formation : 



Sandstone, gray, liard, iioorly bcddcd 6 



Shale, soft, sandy, mostly covered 44 



Sandstone, grayish-brown, poorly bedded to massive, with irregular, short lenses of 

 gray concretionary sandstones. Horizon at top with numerous shells of the 

 brackish-water species : 



Ostrea sp. 

 Horizon at basc with numerous shells of marine spccies: 



Anatina sulcatina Shumard Melania wyomingensis Mcek 



Anatina? n. sp. Modiola attenuata Meek and 



Cardium whitei Dall Hayden 



DentaUum sp. M. herseyi White 



Discoscapliitcs cheyennensis Ostrea sp. 



(Owen) Mcek Pholadomya subventricosa 



Fasciolaria? cheyennensis Meek Sphairiola sp. 



and Hayden Sphenodiscus lenticularis (Owen) 



Legumen planulatum Conrad Meek 



Mactra nitidula Meek and TeUina scitula Meek and Hayden 



Hayden Tellina sp. 



M. alta Meek and Hayden Yoldia scitula Meek and Hayden ... 23 



Shale, soft, gray, sandy, mostly covered in linear valley 112 



Sandstone, soft, brownish-gray, with concretionary masses; wood fragments 



scattered 48 



Shale, soft, grayish-brown, sandy, mostly covered 24 



Sandstone, gray to brown, massive, cross-bedded, with few layers of grayish-brown 



sandy shale, f orms prominent scarp 125 



Total Fox Hills formation 382 



Lewis shale : 



Shale, gray, with minor amount of sand at top. Thickness not measured. 



Elk Mountain Road, Wyoming, Locality P. 374 



The stratigraphic section at this locahty chffers only in details froni that of the 

 Corson Ranch and Walcott localities. The exact position of Locahty P. 374 (NE. 

 I sec. 13, T. 21 N., R. 81 W.) and the areal distribution of formations in this region 

 are shown in figure 6. 



The occurrence of fossil leaves in the lower Medicine Bow formation had not 

 been previously reported in this vicinity. The presence of the Sphenodiscus zone ' 

 of Fox Hills age directed our attention to the region, resulting in the discovery of 

 several leaf horizons in the overlying 1200 feet of beds. Additional coUections of 

 both Fox Hills and Medicine Bow invertebrates were also secured. The measured 

 section, indicating the Uthologic characters and the position of faunal and fioral 

 zones (figure 5), is as foUows: 



I Dobbin, C. E., Bowen, C. F., and Hoots, H. W., U. S. Geol. Survey BuU. S04, 21, 1929. 



