Emery — Green River Desert Section, Utah. 577 



of shale more resistant than the rest of the formation 

 and which erodes into small lozenges, steel gray on the 

 weathered face. This together with the tendency of the 

 shale to ring when trod npon leads one to suspect that it 

 may represent the Mowry shale of "Wyoming which lies 

 in a somewhat stratigraphically similar position. With 

 this resistant shale are associated, near Tidwell, minor 

 sandstones containing sparsely distributed, small black 

 quartz pebbles with which were found fragments of 

 Inoceramus sp. and sharks' teeth belonging to Lamna and 

 possibly other genera. The black quartz pebbles sug- 

 gest that these beds may represent in this region the 

 sandstones of the Frontier formation of "Wyoming. 



The following species identified by Doctor Stanton as 

 Benton in age were collected from calcareous sandstone 

 nodules in the shale about 50 feet above the base of the 

 formation 3 miles northwest of the Greenriver-Hanks- 

 ville road: 



Gryphaea neivberryi Stanton Exogyra suborticulata La- 



Plicatulaf sp. marck? 



Cardium paupercidum Meek Veniella martoni M. and H. 



Gryphaea neivberryi Stanton occurs profusely at the very 

 base of the formation and fragments of Inoceramus sp. 

 are widely distributed through the lower part of the 

 series. 



Richardson, Lupton and others who have studied this 

 shale near Greenriver have correlated it with the Mancos, 

 and fossil evidence amply confirms the correlation. The 

 more resistant band of shale described as lying about 

 200 feet above the base of the formation is to be cor- 

 related I think with the Ferron sandstone member of the 

 Mancos, 2S for although this part of the shale cannot be 

 actually traced into the Ferron east of Greenriver yet the 

 distance between the two outcrops is so small and their 

 stratigraphic position is such that there can be no doubt 

 of the correlation. 



28 Lupton, C. T., op. cit. 



