Shea les 
Red Beds 
MORRISON SHALES OF COLORADO AND NEW MEXICO 4! 
with clay. This series in turn rests upon red sandstones of 
typical Red Beds type. The shales thicken from this point 
toward the east. In a section fourteen miles east.of Folsom, 
the shales are about 200 feet thick. The gypsum becomes less 
250 feet sandstone, massive, quartzitic, cross-bedded, slightly con- 
glomeratic in places. A thin seam of blue clay 100 feet from 
the base. 
40 feet colored shale containing layers of argillaceous sandstone 
and limestone. 
50 feet coarse grained loose textured sandstone. 
10 feet conchoidal limestone with clay and coarse sand at the base. 
10 feet arenaceous shale. 
I to 3 feet conchoidal limestone. 
40 feet variegated shale. 
3 feet argillaceous limestone. 
40 feet shale containing irregular seams and masses of agate-like 
concretions, colored in varying shades of blue and pink. 
5 feet sandstone. 
20 feet gypsum interbedded with clay. 
HOW SUGvsrGloe O56 
red to purple sandstones and shales. 
Fic. 3.—Section 2, in the canyon of the Rio Cimarron east of Long Canyon. 
important eastward and is absent in places, as shown in the 
detailed sections on opposite page. 
Still further to the east, below the junction of Long Canyon 
and the Rio Cimarron, an isolated mesa stands in the midst of 
the canyon. The sides of the mesa are well exposed and the 
