- SHUMARD—GEOL. OF N. MEXICO. 845 
dance. In many places, beds of considerable thickness ap- 
pear to be almost entirely composed of the remains of Cri- 
noidea. In addition to these, the rock presents a in 
variety of other forms, among which we recognize t the 
cora, and P. punctatus. 
re granite was only observed near the eastern side of the 
mountains, in the form of detached conical hills, above the 
highest of which the edges of the uplifted tie en strata 
are seen to project many hundred feet. These hills ut 
spurs of the eruptive portion of the Organ Range, which: only 
4 few miles further south rise majestically to the height of 
several dhdsatd feet. The rocks composing these hills do 
hot differ esse: h 
are me asually of a light. gray color, and contain a much larger 
portion of felspar than usual, and a deficiency of mica. 
ee appear to be ee ine disinte- 
= Dec. 18,, Started at 8 o’clock. Having with some little 
Laupos y regained the mouth of the cafion, we travelled du- 
an of the day in . Sob aedo'dt § direction, keeping 
we: ase of the mountains as practic icable. 
M Mowsain as. as obse 
nh to: er ey two Otho sad fiv 
