38 M. S. Lull — Dinosaurian Distribution. 



to assume even a partial closure, as my map (fig. 9) will 

 show. De Lapparent's maps show no connection between 

 Gondwana Land and Patagonia until the Basal Eocene, which 

 is too late for the migration of the Patagonian (Danian) dino- 

 saurs from the northeast. The closure may have occurred 

 not long before, however, so far as dinosaurian evidence is 

 concerned. 



VII. Bibliography. 



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Guaranitic. formation of Rio Sehen. Anal. Soc. Cient. Argentine, 



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 Geikie, A.— 1903. A Text Book of Geology. 'London. 

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Journal, 3d ser., vol. xlv, pp. 135-144. 

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