Emery — Green River Desert Section, Utah. 569 



In driving from Castledale to Greenriver, Mr. H. S. 

 Palmer and I noted fossils at this horizon at the north 

 end of the Swell and Lnpton reports this limestone to be 

 fossiliferons in Castle Valley on the west side of the 

 Swell, where in addition to the species listed above he 

 found Modiola subrimicata Meek. 18 



Along Green River south of San Rafael River the 

 limestone of the Todilto (?) directly overlies the massive 

 Wingate sandstone. The limestone is here barren of fos- 

 sils and is 4 feet thick, blue-gray, and dense in texture 

 though it is possible to see flashes from crystal faces when 

 a hand specimen is turned in the sun. With the lime- 

 stone is interbedded chert, and in places there are irreg- 

 ular patches of calcite. This limestone strongly reminds 

 me of the Todilto limestone in the type locality at Todilto 

 Park, north of Fort Defiance, Ariz. 



The sharp lithologic contrast of the Todilto (?) and 

 Wingate and especially the much disturbed character of 

 the lower beds of Todilto (?) in some places suggests 

 that these formations are separated by an unconformity. 

 The pronounced irregular surface of the top of the 

 Todilto (?) into which the overlying Navajo fits, sug- 

 gests that the Todilto (?) is also limited above by an 

 unconformity. 



The following detailed section furnishes an idea of the 

 character of the Todilto ( ?) formation in the Green River 

 Desert : - 



Section of Todilto (?) formation in sec. 28 T. 24 S., 

 B. 16 E., Salt Lake Meridian, Utah. 



1. Sandstone, red, massive, cross-bedded Navajo sand- 



stone. Erosional unconformity? 



2. Sandstone, like (4), contact with massive red sand- 



stone is irregular 16'' 



3. Sandstone, light-colored, weathering light green; 



coarse-grained, irregularly bedded 11' 



4. Sandstone, dark red, coarse-grained, rather irreg- 



ularly bedded, with ripple-marked layers 4"-15" 



4hick 68' 



5. Sandstone, pinkish gray, massive, cross-bedded 



Wingate sandstone. 



95' 



18 Lupton, C. T v Geology and coal resources of Castle Valley, in Carbon, 

 Emery, and Sevier counties, Utah, IT. S. Geol. Survey, Bull. 628, p. 24, 1916. 



