74 TRANS. OF THE ACAD. OF SCIENCE. 
1. Quaternary Conglomerate, composed of limestone from the 
Guadalupe Mountains +++ Seo ore CFO COS COTSES SereHs oe 70 fet 
2. Upper rvaceons lime settee ce : oe 
3. Lower Cretaceous varia ey sandstone (as. far as 5 bored) «: eae ere 
Total thickness ++ 1080 fet 
The rocks of this vicinity, save the limestone pi on 
our last day’s journey, were found to differ somewha’ in gen- 
eral character, from those observed further to thee ard 
on our line of march. The limestone, here, a a thick 
ness of over a hundred feet, didibiting itself chiely inthe 
form of ore Sore sc hills and rough cliffs, sometimes with 
vertical fa aces rising above the creek sean 
bed to the height of fy or sixty feet. The rock is : 
of a color and earthy texture, and con- 
tafinis humerous apliarottul cavities from a fourth to a hal a 
inch in om sel = are sometimes partially filled 
loos 0 arth. In one locality, the expoued edges 
of the strata oo covered with an incrustation of salt @ : 
