42 WILLIS T. LEE 
out-cropping edges of the formations easily accessible. The 
upper member of the Red Beds at this point is gypsum. 
Between this and the Dakota which caps the mesa, occurs 
about 200 feet of variegated shales containing a subordinate 
amount of sandstone and impure limestone, as shown in the 
accompanying detailed section, Sec. 2. 
Fic. 4.— Photograph taken near Exeter post-office, N. M., showing the Exeter 
sandstone at the top of the butte, lying unconformably upon red beds. 
The next section taken was a few miles east of Exeter post- 
office. Numerous buttes and mesas, varying in size from small 
mounds to table lands many acres in extent, have been left 
standing in the midst of the canyon in this vicinity. They rise 
abruptly from the broad, well graded bottom which is several 
miles wide at this point. The larger mesas are capped by the 
Dakota sandstone, while the smaller ones have lost their pro- 
tecting caps. On the butte, shown in the photograph, Fig. 4, 
the Dakota and the underlying shales, have been removed. 
They appear however in the point shown at the right in the 
