FOX HILLS AND LOWER MEDICINE BOW 13 



east of thc Walcott-Ferris ranch road, 5 miles N. 15° E. of the town of Walcott. 

 Collections of both invertebrates and plants were secured from several horizons. 

 The exact position of LocaUty P. 373, from which the plant rcmains werc obtained, 

 is in the SE. \ scc. 36, T. 22 N., R. 84 W., shown in figurc 4. The dotails of the 

 mcasured section and the position of faunal and floral horizons (figure 5) are as 

 follows : 



Sedion in the Lewis, Fox Hills, and Medicine Bow formations in sec. 1, T. 21 N., 

 R. 84 W., and sec. 36, T. 22 N., K. 84 W., Wyo7ning 



Thickness 

 Medicine Bow formation (lower part) : ^" f^^^ 



Shale, gray, with thinly bedded, gray sandstone lenses 2-5 feet thick at irregular 

 intervals. Horizon 20 feet from top contains fresh-water molluscs: 



Corbicula sp. 



Goniobasis tenuicarinata Meek and Hayden 

 Horizon 29 feet from top yielded the following species of fossil plants: 



Carpites walcotti Pistacia eriensis 



Cinnamomum affine Rhamnus saUcifoHus 



CjTeracites sp. Sabalites eocenica 



Dombeyopsis trivialis Trochodendroides nebrascensis 



Ficus planicostata Viburnum marginatum 



Leguminosites arachioides minor Zizyphus hendersoni 



Myrica torreyi • ■ • • ; 



Shale, gray to brownish, sandy, with occasional thin irregular lenses of concre- 

 tionary grayish-brown sandstones. Fresh-water molluscs at top: 



Campeloma nebrascensis nebrascensis Meek and Hayden 



Tulotoma thompsoni White 



Unio sp. 

 Leaf horizon at base: 



Carpites walcotti Pistacia eriensis 



Celastrus taurinensis Rhamnus cleburni 



Dryophyilum subfalcatum Rhamnus sahcifoUus 



Ficus planicostata Trochodendroides nebrascensis 



Magnohophyllum cordatum Viburnum marginatum 



Myrica torreyi 



20 



Shale, gray, sandy, with few thin lignitic shale beds and intercalated thin gray 



sandstones. Fresh-water molluscs one foot from top: 



Campeloma nebrascensis nebrascensis Meek and Hayden 

 Unio priscus abbreviatus Stanton and Hatcher 

 U. priscus n. var.? 



Fossil leaves at horizon 20 feet from top: 



Carpites walcotti Pisonia? racemosa 



Celastrus taurinensis Pistacia eriensis 



Cinnamomum affine Quercus viburnifoHa 



Dombeyopsis trivialis Rhamnus cleburni 



Ficus planicostata Rhamnus salicifolius 



MagnoHophyllum cordatum SabaHtes eocenica 



Myrica torreyi Trochodendroides nebrascensis 



Palffioaster inquirenda Viburnum marginatum 51 



Shale, gray to brown, intercalated with thin lenses of concretionary sandstone, two 



Hgnitic shale beds near base "*^ 



