BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 14, pp. 305-336, PLS. 37-46 SEPTEMBER 1, 1903 



LEUCITE HILLS OF WYOMING 



BY J. F. KEMP AND W. C. KNIGHT * 



(Read hefore the Society December 31, 1902') 



CONTENTS 



Page 



Historical review 306 



Previous papers 306 



Varieties of rock 308 



Geographical situation and general character of the region 309 



General geology 309 



The twenty-two Leucite lulls 311 



Zirkel mesa 312 



Geology 312 



Cones 314 



Petrography 314 



Emmons mesa 316 



Osborn mesa 316 



Cross mesa 317 



Hatcher mesa 318 



North Pilot mesa 318 



North table 320 



South table 320 



Remarks on North Pilot mesa, North table, and South table 321 



Volcanic necks and dikes southeast of North Pilot mesa . 321 



Wortman dike 321 



Iddings butte and dike 322 



Weed butte 322 



Hallock butte 322 



Talus covered hills 322 



Endlich hill 322 



Hague hill 323 



Orenda mesa 323 



Black Rock mesa 323 



Steamboat mesa 323 



Badgers teeth 326 



Boars tusk.. 327 



Matthew hill 329 



Pilot mesa 330 



Tabulation and summary of exposures 33 1 



* While this paper was in press Professor Knight died suddenly at Laramie July 28, 19U3. 

 XLIV— Bui,T,. Geol. Soc. Am., Vol. 14, 1902 (305) 



