RED BEDS IN LARAMIE MOUNTAIN REGION 



725 



This determination, which I made several years ago and announced to the 

 Society, was verified in the region south of Laramie, where we found the lower 

 division represented by a thick mass of red grits with occasional beds of 

 limestone. It was in the upper portion of this series that Professor Knight 

 obtained an extensive collection of Upper Carboniferous fossils, which verified 

 the idea that the lower Red beds represent the southern extension of Upper 

 Carboniferous limestones and sandstones of the region north. The overlying 

 Red beds, which I recognized as the Chugwater formation, are several hundred 

 feet thick, and I learned that in these Professor Williston has obtained, from 

 near Red Mountain, the remains of vertebrates which are regarded as Triassic 

 in age. As from the molluscan remains it would appear that the greater part 

 of the Chugwater formation in the region north is of Permo-Carboniferous age, 

 there is here an apparent contradiction of the evidence. So the matter stands 

 at present, but during the coming season a special investigation will be made 

 to obtain additional paleontologic facts. 



TERTIARY TERRANES IN NEW MEXICO 

 BY CHARLES R. KEYES 



[Abstract] 



In the general survey which has been taken recently of the Tertiary forma- 

 tions of the region much new information has been obtained. The work of a 

 generation ago has been adjusted to the new scheme. Some of the Tertiary 

 formations are typical fluviatile deposits ; others were deposited in water. 

 Eocene, Miocene, and Pliocene epochs are represented by depositions. The 

 general section is as follows : 







300 feet. 











800 " 

 300 " 













W CO ~» o 



o o o c 

 o o o o 













The Tertiary deposits of New Mexico are much wider spread than has been 

 supposed. As the period was marked by extensive volcanic action, the lava 

 flows and intrusions have important relationships to many of the formations. 

 The recent ascribing of a fluviatile origin to most of the Tertiary formations 

 of the region is believed to be erroneous, and is due largely to a confusion of 

 Quatenary deposits with the more recent Tertiary beds. The discriminating 

 criteria of fluviatile formations are discussed in this paper. 



QUATERNARY HISTORY OF THE UPPER MISSISSIPPI VALLEY 

 BY WARREN UPHAM 



[Abstract] 



Evidences of preglacial high uplift of this region, as also of all the glaciated 

 area of the continent, are noted; and this altitude, continuing nearly to the end 



