of the Bear River Formation. 101 



No. 10. Light gray sandstone 20 ft. 



No. 11. Slope and unexposed space, perhaps 200 yards or 

 more across. 



No. 12. Light gray sandstones and clays, including a bed 

 of good coal, said to be 7 1 feet in thickness ; all dipping 

 south-southeast 55° below horizon ; and the sandstone 

 above the coal containing many casts, Inocerumus prob- 

 lematicus, with a few casts of Cardium and undeter- 

 mined univalves ; altogether showing about - 150 ft. 



No. 13. A valley or depression showing no rocks, perhaps 

 150 yards across. 



No. 14. Ferruginous sandstone in thin layers, dipping 



northwest about 80° below horizon 40 ft. 



No. 15. Bluish laminated clays with, at top (left or west 

 side), a two-foot layer of sandstone, containing frag- 

 ments of shells not seen in a condition to. be determined, 125 ft. 



No. 16. Clays and sandstone below (20 feet) ; gray and 



brown pebbly sandstone above (25 feet) 45 ft. 



No. 17. Brownish and bluish clays, with some beds of 



white, greenish and brownish sandstones 115 ft. 



No. 18. Hai*d gray conglomerate, standing nearly verti- 

 cal, and forming crest of hill about 350 feet high . - 40 ft. 



No. 19. Slope showing above some masses of conglome- 

 rate, 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 600 ft. 



No. 20. Greenish-white sandstone 40 ft. 



No. 21. Brownish clays and sandy layers 60 ft. 



No. 22. Brownish clays and beds of sandstone, the latter 



light gray below 110 ft. 



No. 23. Whitish sandstone — forms crest of hill about 220 



to 240 feet in height 40 ft. 



No 24. Conglomerate and some red clays 20 ft. 



No. 25. Brownish and reddish clays with a few distantly 

 separated thin beds and layers of gray sandstone, alto- 

 gether 750 to 800 feet in thickness 800 ft. 



No. 26. 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 80 ft. 



No. 27. A long space of perhaps 260 yards or more, with 

 only a few low exposures of light-gray sandstone, show- 

 ing a slight westward dip. 



No. 28. Numerous thin seams and layers of dark carbon- 

 aceous shales, with harder thin bands of various colored 

 argillaceous, arenaceous and calcareous matter, includ- 

 ing a few very thin streaks of coal ; the whole being 

 highly charged with vast numbers of fresh and brack- 

 ish-water shells, such as species of Unio, Corbicula, 

 Oorbula, Pyrgulifera, Viviparus, MelampKS, etc. Dip 

 nearly east, about 75° below the horizon ; thickness 175 

 to 200 feet exposed 200 ft. 



Am. Jour. Sci.— Third Series, Vol. XLIII, No. 254.— February, 1892. 



7 



