W. Cross — Post- Laramie Deposits of Colorado. 25 



examine the region, in connection with other field work, and 

 kindly allows me to state the results. At Windy Gap, a few 

 miles east of south from Canon City, Mr. Eldridge found the 

 normal section of the Laramie sandstones very steeply up- 

 turned, resting on Montana shales, while above them came a 

 heavy conglomerate composed mainly of Archaean debris, but 

 containing in addition pebbles recognized as belonging to 

 various older sedimentary horizons, such as the Niobrara and 

 Dakota Cretaceous, and the Jura. These conglomerates are 

 also upturned, but, probably because they come directly in the 

 fold, they are less steeply inclined than the Laramie. Angu- 

 lar unconformity with the Laramie was not determined. 

 Separated from the conglomerate by a gap of 500 feet, in 

 which there are no outcrops, are horizontal beds of conglom- 

 erate consisting of anclesitic pebbles. As the fold is plainly 

 abrupt, this position is not evidence of angular unconformity. 



Mr. Eldridge did not have time to trace out either of these 

 formations, which, though apparently remnants at the place 

 observed, are probably represented elsewhere in the immediate 

 vicinity. The fact was established, however, that two forma- 

 tions corresponding in stratigraphical position and lithological 

 character to the Arapahoe and Denver beds exist near Canon 

 City. 



Animas River. — Through the courtesy of Dr. C. A. White 

 and his assistant, Mr. T. W. Stanton, I am enabled to state 

 that the latter has recently found the formation crossing the 

 Animas River about five miles south of Durango, Colorado, 

 which is represented as Laramie upon the Hayden map, to 

 consist of conglomerates, sandstones and shales, w r hose material 

 is of andesitic rocks, as far as shown by the specimens col- 

 lected. By referring to the Hayden atlas of Colorado, sheet 

 15, it will be seen that the coal-measures of this region were 

 there referred to the Fox Hills, though their identity with the 

 normal Laramie measures elsewhere in Colorado is at present 

 probably unquestioned by any one. 



On the western bank of the Animas River Mr. Stanton 

 found a bed of conglomerate about 200 feet thick resting upon 

 the coal-measures with apparent conformity. The specimens 

 of this conglomerate collected by him are purplish or yellow- 

 ish brown in color, the pebbles are of hornblende- or pyroxene- 

 andesite, and the matrix is a gravel of the same character. 

 Above the conglomerate are brown sandstones, very similar to 

 the Denver sandstones of Table Mountain, and in one stratum 

 some fossil leaves were found. The only identifiable species 

 collected has been determined by Mr. F. H. Knowlton as 

 Magnolia tenuinervis Lx. The specimen first described by 

 Lesquereux came from the Denver beds of Table Mountain. 



