TE SETA DN GANMON: OF ELE COLORADO: 323 
. ; \ Feet. Feef. 
A layer of vesicular lava with a thin stratum of sandstone 
at the summit - 2 - - - - se) 
g. Solid, compact lava, of a dark-green and reddish tingé, 
with columnar structure partially developed in the central 
portion. This band appears to be formed of three flows 
in quick succession, as no sedimentary material accumu- 
lated on the surface of the two lower; 25, 125 and 25 feet; 
total - - - - - - = 9 n78 
4. Reddish-brown sandstone, compact and slightly metamor- 
phosed toward the summit : - - - 15 
z. On the weathered surface this flow presents a slope of 25° 
to 30°, rarely forms a cliff, as do the flows above, and the 
rocks crumble into a rather light olive-green, coarse sand. 
Thin beds of reddish-brown sandstone occur in several 
places, and one, 125 feet from the base, is quite persistent 
in its horizontal extension. The upper surface of the flow 
is slightly undulating and more or less nodular - = =250 
——- .800 
3. Sandstones (upper) : 
a. Shaly, vermilion, rather fine-grained sandstones, with 
intercalated bands of a greenish-gray, followed below by 
700 feet of vermilion beds of a uniform character, and 
massive beds with arenaceous, shaly partings, the massive 
beds breaking up into shale and sandstone on the talus 
slopes. Ripple-marks and shrinkage-cracks characterize 
the upper, shaly beds - - - - = 17 30 
4. The vermilion sandstones of @ pass into chocolate-colored 
sandstones, that for 125 feet down unite in the general 
slope of the beds above. Below, a cliff is formed of five 
massive bands of chocolate-colored, slightly micaceous 
sandstone, separated by shaly sandstone partings of a 
greenish color below and a chocolate color above - 925 
¢. Reddish-brown to chocolate, more or less shaly sandstone, 
125 feet, underlain by 300 feet of friable sandstone and 
arenaceous and micaceous shale - - a Alps 
da. Irregularly bedded, compact sandstone : 
Curiously twisted and gnarled layers - - Soe lis 
Massive, grayish layer - - - 2 1© 
Light-gray layer with reddish spots, friable, shaly in 
places - - - - - - 125 
150 
Ray hee. 
