SHUMARD—GEOL. OF N. MEXICO. 347 
course and enter t on. It proved to be exceedingly 
d presented on eee side precipitous walls of 
sive limestone of about e same altitude as those pate 
When x struck with the hammer : emits a ak hurous med 
tn ca eafion spied to be about six miles in length, and 
Saas few yards to a mile wide, and appears to have been 
hollowed ~ of the solid rock by erosion. Near the eastern 
- extremi ream of clear water gushes out from near 
‘the base of the strata, and, after flowing for several aed 
Yards in an easterly direction, again Desens beneath the 
tee 15. Shortly after starting this morning we reach hed 
beds of mi ca and hornblende schist, whie ated to 
y exhibited, rived at the eastern extremity 
ain observed in tl 
peneahte: In front of oth : 
Lakes,” vibe is here about oes 
