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Scientific Intelligence. 



6. Correlation between Tertiary Mammal Horizons of Europe 

 and America, by Henry Fairfield Osboun". (Annals N. Y. 

 Acad. Sci., vol. xiii, No. 1, pp. 1 to 72, July 21, 1900.) — In the 

 two papers here published together Prof. Osborn sets forth his 

 mature views upon the Zoogeography of Tertiary Mammals. 

 In the introduction he makes an urgent plea for the estab- 

 lishment of uniform divisions of the Tertiary and for the inter- 

 national usage of common terms both as to life stages and life 

 forms, and expresses confidence that approximate synchronisms 

 can be established between the European and American Tertiary 

 formations. For. several years he has been attempting to correct 

 these correlations and three trial sheets have been prepared and 

 submitted to experts in Europe and this country for their criti- 

 cism ; as a result he publishes the following as a preliminary 

 expression of the approximate correlations of formations : 



I. Stratigraphical Correlation: Preliminary. 



Lyell's System. 

 Pleistocene 



Approximate 

 American Parallels. 



«j pper 

 Middle 

 Lower 



f Upper 

 Pliocene \ Middle-) 



Post Glacial 



Glacial and Interglacial 



Preglacial 



Sicilien 

 Astien 

 1 Plaisancien 

 (_ Lower Messinien 



Miocene 



Upper 

 Middle 

 Lower 



Tortonien 

 Helvetien 

 Langbien 



f Upper Aquitanien 



Oligocene <{ 



i 

 I 



Lower 



j Stampien 



| Infra Tongrien 



Eocene 



f Upper Ligurien 



! M . jni ( Bartonien 



Middle i T , , • 

 j ( Lutetien 



' Lower Suessonien 



Basal 



Thanetien 

 Montien 



? Equus Beds 

 ? Blanco 



Upper Loup Fork 



Loup Fork 

 Lower Loup Fork 

 and Upper John Day 



Lower John Day 

 (Diceratherium Layer) 



White River 



Bridger and Uinta 

 Lower Bridger 

 Wind River ~ 

 Wasatch 

 Torrejon 

 Puerco 



All the levels above the Stampien are regarded by the author as 

 imperfectly established. 



In discussing the available evidences of parallelism, the follow- 

 ing are cited as some of the more important tests : I. Common 

 Genera ; II. Similar Stages of Evolution ; and he refers particu- 

 larly, under this head, to the pattern of the molar teeth, the 

 transformation of the pre-molar teeth, the complication of molar 



