1 aera 
DENVER & RIO GRANDE WESTERN ROUTE. Zhi 
cuts through others, and finally, at Cedar siding, approaches the 
margin of the shale and at the same time attains the level of the 
great terraces that were so conspicuous from points near Grassy 
siding. When seen from their own level these terraces are very 
extensive and appear like a vast flat plain. 
Fictre 56.—Terraces at head of Grassy Creek valley. 
In the vicinity of Cedar siding the lower part of the shale con- 
tains many beds of sandstone and some conglomerate. This part of 
the formation thickens considerably toward the south for 20 or 30 
miles to a place where it contains several valuable 
beds of coal and is known as the Ferron sandstone. 
About a mile west of Cedar siding a sharp upward 
bend of the rocks terminates the outcrop of the 
shale and brings to the surface the Dakota sandstone and, underlying 
it, the maroon and green beds of the McElmo. The railroad at this 
point is on the bank of a creek called Sunnyside Wash, and it fol- 
lows the valley of this stream to the north until near milepost 600 
the railroad passes from the varicolored beds of the McEImo into a 
broad, flat valley cut in the Mancos shale. 
On the right may be seen the branch line of the Denver & Rio 
Grande Western that leads to Sunnyside, one of the largest coal 
mines in the district and the only one that produces a merchantable 
quality of coke.** Plate LX X XVI, B, shows the coke ovens at Sun- 
nyside. The two lines run nearly parallel for some 
distance but finally unite at the station of Mounds. 
pak 442 feet. (See sheet 9, p. 232.) To the casual traveler the 
country over which he has been riding, as well as 
that which he can see about Mounds, probably appears to be bar- 
ren and valueless, but should he pass this way in sheep-shearing time 
Cedar. 
Elevation 5,166 feet. 
Denver 594 miles 
Mounds. 
“The following description of the Coal has been mined at Sunnyside 
Mines at Sunnyside is given by Frank | since about 1900. The town, mine 
R. Clark, who has made a careful geo- | tipple, and coke ovens are in the mouth 
logic survey of the region: of Whitmore Canyon at the end of the 
