153 GEOGEAPHIC DISTRIBUTION. 



Below I reproduce the section made by Professor Meek oh Sulphur 

 Creek to which reference has been made in a previous chapter. I copy his 

 numbers and characterization of the beds, but group them in accordance 

 with the scheme presented in this report. I also invert the order. 



SECTION OF THE EOCKS EXPOSED ON SULPHUE CEEEK, NEAE BEAE 



EIVEE, WYOMING. 



POINT OF ROCKS GROUP. 



No. 1 (28), 200 feet. Numerous thin seams and layers of dark car- 

 bonaceous shales, with harder thin bands of various colored argillaceous, 

 arenaceous, and calcareous matter, including a few very thin streaks of coal ; 

 the whole being highly charged with vast numbers of fresh and brackish- 

 water shells, such as species of UniOj Corbicula, Gorbula, Pyrgulifera, Viri- 

 parus, Melampus, & c. Dip nearly east, about 75 below the horizon; thick- 

 ness 175 to 200 feet exposed. 



No. 2 (27). A long space of perhaps 260 yards or more, with only a 

 few low exposures of light-gray sandstone, showing a slight westward dip. 



No. 3 (26), 80 feet. Gray sandstone in place, apparently connected 

 with some masses (that may not be in place) so as to include space enough 

 for 60 to 80 feet, forms crest of a hill. 



No. 4 (25), 800 feet. Brownish and reddish clays with a few distantly 

 separated thin beds and layers of gray sandstone, altogether 750 to 800 feet 

 in thickness. 



No. 5 (24), 20 feet. Conglomerate and some red clays. 



No. 6 (23), 40 feet. Whitish sandstone forms crest of hill about 220 

 to 240 feet in height. 



No. 7 (22), 110 feet. Brownish clays and beds of sandstone, the latter 

 light gray below. 



No. 8 (21), 60 feet. Brownish clays and sandy layers. 



No. 9 (20), 40 feet. Greenish white sandstone. 



No. 10 (19), 600 feet. Slope showing above some masses of con- 

 glomerate, like that of division 18, perhaps not in place, with, at places below 

 this, some reddish clays; altogether space enough for 500 to 600 feet in 

 thickness. 



