/ ^tc^^ L.<^LA4!;iAvA-^ fc 



[Annals N. V. Acad. Sci., Vol. XIII, No. ij. pp. 1-72, July 18, 190c.] 



CORRELATION BETWEEN TERTIARY MAMMAL 

 HORIZONS OF EUROPE AND AMERICA 



An Introduction to the More Exact Investigation of 



Tertiarv Zoogeographv. Preliminarv Studv 



WITH Third Trial Sheet 



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

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



By Henry Fairfield Osborn 

 CONTENTS 



PART I.— ADDRESS, 1899-19C0. 

 PARALLELS BETWEEN TERTIARV HORIZONS 3 



INTRODUCTION 3 



European Corr elations 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 Palsearctic and Nearctic forms 7 



II. CLASSIFICATION OF THE EUROPEAN TERTIARV 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 10 



3. Egerkingen beds more recent than Puerco, Torrejon or Wasatch.. 11 



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



truly parallel 12 



(1) 

 24.?0«8 



