BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 

 Vol. 8, pp. 127-156 February 17, 1897 



STRATIGRAPHY AND PALEONTOLOGY OF THE LARAMIE 

 AND RELATED FORMATIONS IN WYOMING* 



BY T. W. STANTON AND F. H. KNOWLTON 



{Read before the Society December SI, 1896) 

 CONTENTS 



Page 



Introduction 127 



Ceratops beds of Converse county, Wyoming 128 



Stratigraphy and local development 128 



Correlation as indicated by the invertebrate fauna 135 



Evidence of the flora 136 



Coal-bearing series of the Laramie plains 137 



Localities in Bitter Creek valley 143 



Black Buttes 143 



Point of Rocks 146 



Rock Springs 148 



Evanston and Hodges pass 148 



Other local ities 1 49 



Carbon, Wyoming 149 



Coalville, Utah 150 



Crow creek, Colorado 150 



General considerations 151 



Base of the Laramie 151 



Non-marine invertebrates of the Montana formation 152 



Fossil plants of the Montana formation . , 153 



Top of the Laramie 155 



Introduction. 



Perhaps none of the various formations which contribute Such im- 

 portant elements to the geologic history of the Rocky Mountain area have 

 been the subject of so much discussion and difference of opinion as the 

 series which has come recently to be known as the Laramie and allied 

 formations. This series of strata, first known as the Lignite series, included 

 the coal-bearing strata of the Upper Cretaceous with the lower Tertiary or 

 Fort Union strata and was all regarded as Tertiary in age. Later the Lara- 

 mie was differentiated by King as the uppermost division of the conform- 

 able Cretaceous series, and the Fort Union group ultimately associated 



* Published by permission of the Director of the U. S. Geological Survey. 

 XIX— Bull. Geol. Soc. Am., Vol. 8, 1896 (127) 



