636 



C. L. DAKE 



In this section, Nos. i and probably 2 are thought to be La Plata. 

 No. 6 is almost certainly the same horizon from which the Teasdale 

 collection of fossils was made. It is perhaps 10 miles or less from 

 Cedar Canyon southeast to Teasdale. 



The fossils w^ere submitted to Dr. T. W. Stanton, of the United 

 States Geological Survey, who lists them as follows: Pentacrinus 

 whitei Clark; Camptonectes platessifonnis White; Trigonia quad- 

 rangnlaris HaU and Whitfield; small undescribed gastropods. 



Dr. Stanton^ says, "These fossils show close relationship with 

 the Sundance fauna, but there have been different opinions con- 

 cerning the exact position of the bed containing them with reference 



Fig. 2. — White, red, and green sandy shale and gypsum above marine Jurassic 

 limestone, head of Cedar Canj^on, 6 miles east of Loa, on west slope of Thousand 

 Lake Mountain, Utah. 



to the La Plata. C. T. Lupton, who observed the same fossiliferous 

 horizon, included it in the McElmo and agreed with you in consider- 

 ing the top of the underlying sandstone as the top of the La Plata.^ 

 W. B. Emery, who has had the advantage of field work in north- 

 eastern Arizona and northwestern New Mexico as well as southern 

 Utah, thinks that this fossiliferous Jurassic Hmestone represents 

 the Todilto formation which is near the middle of the La Plata 

 group according to Gregory's stratigraphy in Professional Paper gj. 



' Personal communication. ^ U.S. Geol. Siirv., Bull. 541, p. 125. 



