

^^"^^ 



50 \ 



(hfiM^ 



THE ENVIRONMENT OF VERTEBRATE LIFE IN THE 



LATE PALEOZOIC IN NORTH AMERICA; A 



PALEOGEOGRAPHIC STUDY 



BY 



E. C. CASE 



Professor of Historical Geology and Paleontology in the University of Michigan 





3/ Musevi^ 



Published by the Carnegie Institution of Washington 

 Washington, 1919 



U. S. Natioiiai Mucstua 



