138 PROCEEDINGS OF THE BOSTON MEETING 



reached essentially similar conclusions in respect to the Kansas "Dakota" and 

 the marine Kiowa and Mentoo beds of the same State. 



In southern Kansas the sediments considered Lower Cretaceous begin with 

 the terrestrial Cheyenne sandstone, in which there are fossil leaves of dicoty- 

 ledons belonging to species which also occur in the "Dakota" sandstone. The 

 Cheyenne sandstone is succeeded by the marine Kiowa shales, above which 

 are other terrestrial sediments containing fossil plants like those in the 

 Cheyenne sandstone. 



In central Kansas the series begins and ends with terrestrial sediments. 

 There are three horizons containing marine fossils which are separated by two 

 horizons of terrestrial sediments in which are fossil leaves. The marine 

 fossils are of the same general character as those in the Kiowa shales. The 

 uppermost marine horizon and the overlying and underlying terrestrial sedi- 

 ments are those known as the "Dakota." 



It is quite obvious that all of these strata are of the same general time of 

 deposition, and if the Kiowa shales and the equivalent marine deposits are 

 of Lower Cretaceous or Comanchean age, then the "Dakota" sandstones are 

 of the same age. 



Dr. T. W. Vaughan mentioned the necessity of critical studies of Washita 

 flora of southern Kansas and comparison of it with the so-called Dakota flora 

 of north Texas, and that plans for conducting this investigation have been 

 made. 



Former President John M. Clarke took the chair. 



FURTHER STUDIES ON THE JURASSIC OF CUBA 

 BY MARJORIE O'CONNEI.L 



(Ahstract) 



During the summer of 1919 Mr. Barnum Brown continued his stratigraphic 

 work in Cuba and made extensive collections from the Jurassic rocks, obtain- 

 ing a large and valuable series of ammonites which were submitted to the 

 author for study. In addition to this material, a considerable number of 

 ammonites were received from Dr. Rorg, of Havana, from the study of virhich 

 the existence of the Upper Cortlandian in western Cuba has been established, 

 in addition to the Upper Oxfordian, the discovery of which was announced 

 at the Baltimore meeting of the Society. 



A preliminary paleogeographic map of Cuba, Mexico, and adjoining regions 

 for Upper Jurassic time was presented and a list given of additional species 

 of ammonites not heretofore reported from Cuba. 



Presented without notes. 



Discussed by Dr. T. W. Vaughan, with reply by the author. 



