"870 J. J. Stevenson—Laramie Group of Southern New Mexico 
Art. L.—Note on the Laramie Group of Southern New Memico ; 
by Joun J. Stevenson, Professor of Geology in the Uni- 
versity of New York. 
field is interrupted only by a few narrow cafions and the bluffs 
marking the western edge of the area can be followed as easily 
as those marking the eastern edge of the Trinidad coal field in 
northern New Mexico 
_ The San Pedro locality is nearly nine miles east from the 
Rio Grande, and is about twenty-three miles south-southeast 
from the city of Socorro, whence it can be reached conven- 
Antonio and San Pedro; but before long it will be more con- 
venient of access, as the railroad company contemplate build- 
ing a branch road to the coal. 
n this southern part of the field one observes the same fea- 
tures as on the Galisteo. Instead of the yellow or buff sand- 
stones which predominate in the Trinidad and Cafion City coal 
fields, shales prevail, and for the most part the sandstones are 
t and often argillaceous. Thin bed of hard, fine-grained 
sandstone are shown, with distinct jointing and breaking into 
angular fragments, which retain their sharpness even after long 
exposure to the weather. en seen from a little distance 
these thinner beds resemble sheets of igneous rock. As on the 
Galisteo, beds of iron ore with concretionary structure are 
numerous, as also are beds of ferruginous clay with cone-in- 
cone structure. These ferruginous beds are not confined to the 
lower part of the group. The shales are drab to black and in 
many of the beds are fissile. 
* This Journal, vol. xviii, p. 371. 
