[Annals N. Y. Acad. Sci., Vol. XIII, No. i, pp. 1-72, July 18, igoc] 



CORRELATION BETWEEN TERTIARY MAMMAL 

 HORIZONS OF EUROPE AND AMERICA 



An Introduction to the More Exact Investigation of 



Tertiary Zoogeography. Preliminary Study 



WITH Third Trial Sheet 



Two Presidential Addresses before the New York Academy of Sciences ; first 

 address delivered February 27, 1899 ; second address delivered Febniary 26, 1900. 



By Henry Fairfield Osborx 



CONTENTS 



PART I.— ADDRESS, 1899-19C0. 

 parallels between TERTIARY HORIZONS 3 



INTRODUCTION 3 



European Corr el ations 4 



The Trial Sheets 5 



I. AVAILABLE EVIDENCES OF PARALLELISM 6 



1 . Common Genera and Species 6 



2. Similar Stages of Evolution 6 



3. Simultaneous introduction of new forms 7 



4. Predominance of certain types 7 



5. Convergence and divergence of Palcearctic and Nearctic forms 7 



II. CLASSIFICATION OF THE EUROPEAN TERTIARY 7 



III. COMPARISON OF THE EOCENE IN EUROPE AND AMERICA 9 



1. The Puerco without a Faunal Parallel 9 



2. The Torrejon and Thanetien (Cernaysien) nearly parallel lo 



3. Egerkingen beds more recent than Puerco, Torrejon or \Yasatch.. II 



4. Lower Eocene, Wasatch and Suessonien (Sparnacien, Ypresien) 



truly parallel 12 



(1) 



