J. J. Stevenson—Laramie Group of Southern Colorado. 129 
Arw. XXIL—Notes on the Laramie Group of Southern Colorado 
and Northern New Mexico, East from the Spanish Ranges ; by 
Joun J. STEVENSON, Professor of Geology in the University 
of the City of New York. 
THE most southern of the Laramie coal fields along the east- 
ern base of the Rocky Mountains lies partly in Colorado, and 
rtly in New Mexico. It is rudely lozenge-shaped and has 
its greatest breadth near the southern boundary of Colorado, 
whence it tapers in each direction, pointing out at the north near 
Cucharas Creek, forty miles from the state line, and terminat- 
ing at the south immediately beyond Cimarron Creek, thirty- 
six miles south from the Colorado line. Its area is not far 
from 2200 square miles, and the whole of it, save perhaps 150 
square miles, is included in the district examined by me during 
the season of 1878. With consent of the Chief Engineer, 
U.S. A., a brief synopsis of results is offered here in advance of 
the report to be presented to Lieutenant Wheeler. 
are important, economically, as they keep the 
