STRATIGRAPHY OF TOE LIGNITIC FORMATIONS. 19 



eight feet. This gives sixteen beds of eoal above the great hard sandstone, 

 which was passed by the drill from seven hundred and eighty to eleven hun- 

 dred and eighty feet. 



From Rock Springs to Evanston, tlie Lignitic is overhiid by the strata 

 of the Green River group, which is formed of beds of shale, some calcare- 

 ous, others sandy, with numerous strata of bituminous shale, but as yet no 

 lignite seams, until, reaching Evanston, we find still heavy deposits of 

 lignite coal, as recorded in the section (Animal Report, 1872, p. 838), from 

 top of the hill to base: — 



Feet. 



Conglomerate 40 



Hard yellow, fine-grained, micaceous sandstone 32 



Conglomerate, topped with coarse sandstone 37 



Fine-grained and intermediate layers of coarse-grained sandstone 32 



Conglomerate (lower banks) .' 27 



Bituminous clay 10 



Shale and clay banks, mostly covered 145 



Sandstone in bank 11 



Alternating beds of shale and shaly sandstone lOG 



Shaly sandstone, very hard, sometimes in bank, with dicotyledonous 



plants 11 



Argillaceous shale, with ferruginous concretions and remains of plants. 96 



Coal 5 



Clay and shale 12 



Coal * 7 



Clay 3 



Main bed of coal, with four bands of slate 26 



Shale and clay 8 



Coal 5 



Clay and shale 15 



Iron ore 3 



Clay and shale 15 



I could still mention the Lignitic beds worked at Coalville, not far from 

 Evanston; those of Sulphur Creek, near Beaver River, said to be seven and 

 a half feet; those also of Wasatch County, in Utah, which, according to 



* The lower part of this section is from Dr. A. C. Peale, ADnual Report, 1871, p. 195. 



