T. IF. Stanton — Fox Hills Sandstone. 185 



The following is the list of fossils collected in No. 8 of this 

 section : 



Avicula fibrosa M. & H. 

 Leda ( Yoldia) sp. 

 Sphceriola? cordata I\l. & II. 

 Veniella humilis M. & H. 

 Protocordia snbquadrata E. & S. 

 Linearia? formosa M. & H. 

 Tellina snitida M. & H. 

 Cuspidaria moreauiensi.'i (M. & II.) 

 JSntulis })aupercula M. & H.? 

 Lunatia occidentalis M. & H. 

 Afichura sp. 



Fasciolaria {Piestochilus) culbertsoni M. & H. 

 Haminea, sp. 



Sphenodiscus lentlcularis (Owen) 

 Scaphites conradi (Morton) 

 /Scaphites conradi var. intermedins Meek. 

 Scaphites abyssirms (Morton). 



JSTo. 6 yielded the following : 



Nucida planimarginata M. & H. 

 Avicida fibrosa M. & H. 

 Cardium speciosutn M. & H. 

 Mactra warrenana M. & H. 



When studying the section it was believed that the upper 

 four members belong to the Lance formation, but afterward 

 when comparison was made with sections at tie south end of 

 the field it seemed more probable that all the beds examined 

 here belong to the Fox Hills. The higher unquestioned Lance 

 formation was not studied at tins place. 



Two sections, which have been described by Stanton and 

 Knowlton, were studied at the south end of the area, about 30 

 miles southwest of the mouth of Lance Creek. One of these 

 lies about 2 miles east of Lance Creek, nearly opposite the mouth 

 of Little Lightning Creek, and shows excellent exposures of 

 Pierre, Fox Hills, and the lower part of the Lance formation, 

 all dipping northward 14° to 19°. JSTo attempt was made to 

 obtain a detailed section of the Lance formation, but a meas- 

 urement across the strike as far as the strata have steep dips 

 shows a thickness of about 1700 feet above the upper white 

 sandstone, which was later determined to be the top of the 

 Fox Hills. To this should be added perhaps 400 or 500 feet 

 for the thickness of the nearly horizontal upper strata of the 

 Lance formation. The lowest point at which dinosaur bones 

 were seen is about 300 feet above the top of the Fox Hills. 



The lower part of the section is as follows : 



