FOSSILS FROM COOPER AND DUTTON CREEKS. 141 



(Brachyphylluni, n. sp., and Sequoia relchenbachi) are found at Harpers 

 Station and two other of the named species (Trapa (?) microphylla and 

 Diospyrus (?) ficoidea) are found at Black Buttes and Point of Rocks. 

 The latter species are also found in the Fort Union beds, but in the lower 

 horizon. The other named species {Asimina eocenica), depending on a 

 single example, has been found in the Denver beds at Golden, Colorado, 

 and at Carbon, Wyoming. The unnamed species, as far as they have 

 affinities, appear to approach more closely to those of the so-called true 

 Laramie. 



The associated strata are not exposed in the immediate neighborhood, 

 but about three miles to the southwest, near the old stage road crossing 

 Cooper creek, beds that are certainly higher in position are very fossilif- 

 erous, yielding a characteristic Fox Hills fauna as follows : 



Micrabacia americana, M. and H. Crassatellina sp. 



Ostrea sp. Tancredia americana, M. and H. 



Anomia sp. Callista {Dosiniopsis) nebrascensis, M. and 



Inoceramus cripsii, var. barabini, Morton. H. 



Inoceramus sagensis, var. nebrascensis, Tellina schula, M. and H. 



Owen. Goniomya americana, M. and H. 



Avicula liugiueformis, E. and S. Corbulamella gregaria, M. and H. 



A vicula nebrascana, E. and S. Martesia sp. 



Gervillia sp. Lunatia concinna, (H. and M.) 



Modiola galpiniana, (E. and S.) Capulus sp. 



Pectunctulus wyomingensis, (Meek). Nautilus dekayi, Morton. 



Protocardia subquadrata, (E. and S.) Baculites ovatus, Say. 



Syncyclonema rigida, (EL and M.) Scaphites nodosus, (Owen.) 

 Luclna subundata, H. and M. 



The third of the plant localities above referred to is six or seven miles 

 northeast of the coal opening last mentioned. It is at a coal mine now 

 known as the " Dutton Creek" mine, although it is not on Dutton creek, 

 but in a ravine leading down to Rock creek, and it may be the Rock Creek 

 coal of the earlier reports. The exposures in the neighborhood are small, 

 and we were unable to determine its stratigraphic relations with any of 

 the other coal beds examined or with any established horizon. The evi- 

 dence of the fossil plants, which are abundant in the shales and sand- 

 stones immediate^ above the coal, is in favor of correlating the coal with 

 that at Carbon and assigning it to a higher horizon than the other coal 

 beds of the Laramie plains. The following species were collected : 



Anemia. Ficus uncata, Lx. 



Glyptostrobus nngeri (?). Ficus, 2 sp. nov. 



Salix media (?). Ficus pseudo-populus, Lx. 



Populus arctica, Heer. Juglans rugosa, Lx. 



