CARBONIFEROUS OF THE SANGRE DE CRISTO 395 
lar to the section north of Mt. Culebra. The following species 
were found: Zaphrentis sp., Orbiculoidea sp., Derbya crassa 
M. & H., Chonetes granulifera Owen, Chonetes mesoloba N. & 
P., Productus nebrascensis Owen, Productus costatus Sow, 
Spirifer cameratus Morton, Reticularia perplexa McCh., Seminula 
argentea Shep., Hustedia mormoni Marcou, Aviculopecten occi- 
dentalis, Astartella concentrica McCh., Schizodus Wheeleri, 
Swall., Bellerophon percarinatus Con., Bellerophon inspeciosus 
White? Soleniscus sp., Conularia? sp., Orthoceras sp. 
SECTION TAKEN AT THE CREST OF THE SANGRE DE CRISTO RANGE, 
BETWEEN MIDDLE FORK AND NORTH FORK OF THE PURGA- 
TOR Vise RIVERS: 
FEET. 
10 Hard quartzitic conglomerate. 
5 Dark shale. 
2 Limestone, fossiliferous. 
12 Red sandstone, with bands of red shale and irregular masses of limestone. 
4 Greenish argillaceous sandstone. 
18 Pink sandstone, argillaceous above, conglomeratic below. 
4 Fossiliferous limestone. 
10 Deep red sandsone, conglomeratic at the base, shaly near the top. 
20 Limestone, arenaceous near the base. 
13 Massive, light-colored grit, coarse and conglomeratic. 
6 Banded sandstone and limestone intimately commingled. The limestone is often 
in more or less rounded masses. Irregular beds of gravel occur in places. 
3 Nodular Jimestone. 
8 Massive limestone. 
3 Shale with limestone nodules. 
23 Massive limestone. 
20 Coarse sandstone, conglomeratic in the lower half. 
8 Massive grit (local unconformity). 
10 Calcareous shale, passing to black shale, with limestone nodules near the top. 
15 Fossiliferous limestone with sandstone layers. Cup corals abundant. 
6 Massive limestone. 
8 Shale. 
2 Coarse grit. 
10 Sandstone with large nodules and irregular masses of limestone. 
25 Shale with bands of sandstone and limestone. 
4 to 12 Banded limestone. 
28 Soft black shale, fossiliferous. 
9g Coarse grit. 
6 Black shale. 
2 to 20 Coarse grit, conglomeratic in places. 
