BULLETIN OF THE GEOLOGICAL SOCIETY OF AMERICA 



Vol. 29, pp. 245-280 JUNE 30, 1918 



PROCEEDINGS CF THE PALEONTOLOGICAL SOCIETY 



AGE OF THE AMERICAN MOERISON AND EAST AFRICAN 

 TENDAGURU FORMATIONS ^ • 



BY CHARLES SCHUCHERT 



{Read before the Paleontological Society December 28, 1916) 



CONTENTS 



Pagp 



Summary 246 



The Morrison and Sundance formations 248 



Names applied to the Morrison 248 



Characteristics and distribution 248 



Relation to adjacent formations 250 



Description of typical Sundance and Morrison sections 251 



General reference 251 



Oil Creek, below Garden Park, Colorado 252 



Como Bluff, Wyoming , 252 



Freezeout Hills, Wyoming , 253 



Northwestern side of Freezeout Hills, Wyoming 254 



Eastern side of Freezeout Hills, Wyoming 254 



Correlation of Sundance and Morrison formations 256 



Opinions and conclusion as to age of the Sundance 256 



Age of the Morrison 259 



General statement 259 



Evidence of the plants 260 



Evidence of the invertebrates 260 



Evidence of the dinosaurs 261 



Correlations 261 



Conclusions 263 



The Tendaguru series , . . 264 



Discovery 264 



General results 264 



General stratigraphy 265 



Section in detail , 268 



Conclusions as to habits and habitats of African dinosaurs 271 



Correlation of the Tendaguru series 275 



Correlations by the Germans 275 



Correlations on basis of dinosaurs 276 



Correlations on basis of marine invertebrates 277 



Conclusions by Buckman 278 



Conclusions by Schuchert 279 



Manuscript received by the Secretary of the Society September 28, 1917. 



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