ON CERTAIN PECULIAR STRUCTURAL FEATURES 
IN THE FOOT-HILL REGION OF THE ROCKY 
MOUNTAINS NEAR DENVER, COLORADO. 
BY 
George Homans Eldridge. 
[Read before the Society November 23, 1889.] 
CONTENTS. 
Introduction_ 
Lithological Character of Formations involved. 
General Features of the Affected Area_ 
Topographical_ 
Surface delineations_ 
Detailed Geology._ 
The Formations and their Relations_ 
The Archiean___ 
The Trias_ 
The Jura_ 
The Dakota_ 
The Colorado J Fort Benton 
[Niobrara_ 
The Montanai Pierre. 
\Fox Hills 
The Laramie_ 
The Arapahoe_ 
The Denver_ 
Special irregularities_ 
Structural Features_ 
Dips_ 
The general fold along base of Range 
Faults_ 
Structural Development of the Area_ 
Introductory_ 
(Table) 
Page. 
248 
249 
250 
250 
251 
252 
252 
252 
252 
253 
254 
255 
255 
256 
257 
257 
258 
258 
258 
258 
258 
259 
259 
260 
260 
30-Bull. Phil. Soc., Wash., Vol. 11. 
(247) 
