724 PROCEEDINGS OF THE OTTAWA MEETING 



ALGONKIAN FORMATIONS OF NORTmYE STERN MONTANA 

 BY CHARLES D. WALCOTT 



The paper is printed as pages 1-28 of this volume. 



P ALE O GEOGRAPHY OF SAINT PETER TIME 

 BY CHARLES P. BERKEY 



The paper is printed as pages 229-250 of this volume. 



CARBONIFEROUS OF THE APPALACHIAN BASIN 

 BY JOHN J. STEVENSON 



The paper is printed as pages 65-228 of this volume. 



OVERLAP RELATIONS ALONG THE ROCKY MOUNTAIN FRONT RANGE IN 

 WYOMING AND COLORADO 



BY N. H. DARTON 



RED BEDS IN THE LARAMIE MOUNTAIN REGION 

 BY N. H. DARTON 



[Abstract] 



During the past season many additional observations were made on the Red 

 beds at various localities in central Wyoming, especially in the vicinity of the 

 Laramie and Bighorn mountains. One of the most significant features was 

 the discovery of a fossiliferous limestone 150 feet below the top of the Red 

 beds, containing a Permo-Carboniferous fauna. The locality was on the Big- 

 horn river 3 miles north of Thermopolis, Wyoming, on the west slope of the 

 Bighorn uplift. The Red beds in this region are nearly 1,000 feet thick and 

 lie upon a well defined series of Upper Carboniferous limestones and sand- 

 stones. In the basal portion of the Red beds in this vicinity and elsewhere 

 Permo-Carboniferous fossils have been obtained in previous seasons. The 

 occurrence of this same fauna at the higher horizon leaves only 150 feet of red 

 shales which may represent the Triassic. The next succeeding formation is 

 the marine Jurassic, which appears to lie unconformably on the Red beds. 



An examination was made of the locality from which Professor Wilbur 

 Knight obtained Carboniferous fossils in the Red beds near Laramie several 

 years ago. His collections were made in vicinity of Red mountain, near the 

 southern margin of the Laramie basin. It was found that on both sides of 

 Laramie mountain the Upper Carboniferous sandstones and limestones in their 

 southern extension grade into and thereby give place to a thick deposit of Red 

 beds. These, along the Rocky Mountain front, become the Lower Wyoming 

 division of Eldridge and the Fountain formation of Gilbert and Cross. The 

 Red beds which overlie the Upper Carboniferous limestones northward continue 

 unchanged into the region of Lower Wyoming-Fountain red-beds as a distinct 

 division, which was recognized by Eldridge as the Upper Wyoming division. 

 The upper division has been designated the Chugwater formation. 



