peale.] RESUME POST-CRETACEOUS LARAMIE GROUP. 631 



and above the greenish and gray beds a series of red sandstones, many 

 of them conglomeritic, were noted. These beds are seen much farther 

 to the north, extending into Mr. St. John's district. ISTo detailed sec- 

 tion was made, but there must be from 6,000 to 7,000 feet of beds. It 

 must be borne in mind that the line between the Laramie Group and the 

 Cretaceous has not yet been drawn in this region. I shall, therefore, 

 not attempt to give any general section of the formation at present. 

 The fossils next found below the Laramie were Jurassic ; but there was 

 plenty of room between the fossiliferous horizons for the entire Creta- 

 ceous series, which is probably present, although not positively recog- 

 nized. 



The series, from the Carboniferous up through the Jurassic and over- 

 lying beds, is perfectly conformable until we reach the Wahsatch Group, 

 which, wherever seen, was distinctly and strikingly uncomformable. 



It must be remembered that the region investigated by us was prob- 

 ably near the western shore line of the Wahsatch Lake, and a consid- 

 erable portion of the area that was below the level of the Laramie sea 

 became land after the deposition of the Laramie beds, or perhaps before 

 the end of the period. The bottom of the Laramie sea appears to have 

 been subjected to a constant and gradual subsidence, as the strata indi- 

 cate their deposition in shallow waters, and the thickness attained by 

 them must be at least 5,000 feet. The upper conglomerates in the 

 Smith's Fork region and between Crow Creek and Beaver Creek resem- 

 ble the lower beds of the Wahsatch Group, although they are firmer; 

 probably from the fact that during the orographical disturbances that 

 occurred after their deposition they were subjected to considerable fold- 

 ing and consequent lateral pressure. 



The lower sandstones are similar to those of the Fox Hdls Group, and 

 as far as knowD the two formations are conformable. There were some 

 indications at the lower end of Ham's Fork Canon that the Laramie 

 Group rested on the upturned edges of the Triassic Eed Beds, but the 

 fossils were not found in place, and other portions of the region seemed 

 to indicate that the Laramie Group was conformable to the underlying 

 formations. 



Organic contents. 



The fossils collected were from two localities in the Green Biver Basin 

 and three in the Smith's Fork aud Bear Biver region. They have all 

 been identified by Dr. White as equivalent to those of the Laramie 

 Group as exposed in the Bear Biver estuary beds. 



The following is the list of these fossds collected during the season, 

 identified by Dr. C. A. White : 



List of fossils from the Laramie Group. 



Coroula sp. % ) West side of Meridian fold in Merid- 



Undetermined forms. ) ional Valley, on Piney Creek. 



Campeloma macrospira. ) T ^ n , i ~ * -n , 



Corbula st> k i Lower end of the canon of Ham's 



Pyrgidiferas V .V* # ) Fork, east side of Oyster Eidge. 



* In addition to these a fragment of a leaf of an Aralia was found. 



