132 J. J. Stevenson—Laramie Group of Southern Colorado. 
1, eB" mw. S7 0” 10” og 
2. Interval —- 1” 0° 8? 21’ 10” 24’ 0" 
Fs Hf; 8° 4 3”. 9” 5:0" 
4, Intorva | ier ss Ge gle 13” 0° 
5. 5” 0” gees ge | eet 9’ 6" 
6. Sabaredl: OL yo 87-6" 13": 6" 
1. Coal, 2” 0" 0” 8" 4 h.9F Vv 0" 
Total, a6” 40", 5 RS 54 8 68’ 6" 
Total of Coal, 9” 10” yo B 10’ 10’ 19’ 6” 
The interval, No. 2, is filled with shale in the first two sec- 
tions, but contains sandstone as well as shale in the last two. 
No. 4is bony coal in the first two, but holds shale and sandstone 
in the last two. No, 6 is filled with clay at all of the localities. 
e coal from the Laramie group in this field is soft. That 
from the Trinidad bed is excellent gas-coal and the slack is 
easily coked. oc coking is done in bee-hive ovens similar to 
those used in western Pennsylvania. Little has been done, 
away from Trinidad, toward developing the mines. The whole 
country is cursed with old Mexican land grants, most of which 
are clouded, so that capitalists hesitate to make investments. 
The Sandstones. 
The sandstones are much alike and few of them are persist- 
ent. They change into shales and back again into sandstones 
in the most perverse manner. Still, some of these beds are 
constant and are serviceable locally as aide 
he Great Sandstone, closing the group within this field, is 
resent at the summits of all divides and is readily recogniz 
y its physical peculiarities. It is yellowish gray, compact, 
and for the most part comparatively fine-grained, though it 
occasionally contains a layer of not very coarse conglomerate. 
This rock is wholly non-fossiliferous at every locality where it 
was examine 
The sandstones above coal beds F, G and H, are usually 
The Hetytentes topics at the base of the series, is com- 
Is inva fine-grained, usually gray, sometimes yellowish gray- 
ey present and forms a distinct gray band on the 
ffs from Cucharas Creek southward to Cimarron Creek, with 
ih blossom of the Dillon coal bed almost immediately above it. 
I ese ue its ae because the rock is loaded with Haly- 
which was not identified with certainty at 
any Sites fess within this field ; though it is abundant at 
rizons in other fields farther north. 
ithout exception, the sandstones are fine-grained at 
