276 TRANS. OF THE ACAD. OF SCIENCE. 
The extent of this region of disturbance could not be ace 
rately determined on account of the levelling effects of the 
subsequent —— and the thickness of Awe 
be sw more recent date; but from the fact, that the 
limestone is enered for a distance of twelve or fifteen miles, 
both east and west of the Pecos River, in nearly horizontal 
strata, and appears merely in gentle praia? at a point 
only a few miles south of the place where the last 
aotlice was seen, it is highly probable that it ‘does neh, ee 
direction, “enegrie fifteen or twenty miles. 
l ving ae 
Sra these were isolated and widely se} 
be "ae og in cl 
nition 
ace resemble ‘= Ga hills pe ioe coul 
farther a forerags jie that the 
pretty 
of a once continuous table land, ¢ 
eh td hove Vili ri ers dl xceed a 
