46 AULILS. 10, 16/373 
stone. Wherever it occurs it forms a series of nearly perpen- 
dicular cliffs, thus making a broad conspicuous band along the 
canyon sides. 
It is evident, then, that the shale formation rests in turn 
(1) upon the gypsum conformably ; (2) upon the gypsum and the 
underlying Red Beds unconformably ; (3) upon the Exeter sand- 
78 feet of hard quartzitic sandstone. 
Io to 15 feet of shale, arenaceous in places. 
6 inches lime concretions. 
8 feet red shale. 
4 feet sandstone. 
50 feet sandstone and shale (débris covered in places). 
30 feet dark red shale. 
4 feet coarse sandstone. 
2 feet blue clay. 
2 feet calcareous clay. 
30 feet blue clay shale with seams of limestone. 
1 foot hard brittle limestone. 
20 feet shale with thin seams of impure limestone. 
10 to 15 feet shale with impure limestone and sandstone bands and 
irregular masses of agate. 
5 feet hard brown, nearly pure limestone. 
20 feet (unexposed). 
35 feet white sandstone, massive below but passing to well defined 
layers above. 
8 feet loose textured and readily weathering sandstone. 
15 feet massive chalky white sandstone, cross-bedded and cavern- 
ous weathering. 
2 feet soft shaly sandstone. 
15 feet massive evenly laminated sandstone, ranging in color from 
red at the base to white at the top. 
red sandstone Jayers interstratified with red and purple shales. 
Fic. 5.—Section 3, near Exeter post-office in the canyon of the Rio Cimarron. 
