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SCIENCE 



[N. S. Vol. XXV. No. 646 



The structural and stratigraphic evidence, 

 pointing to a continental origin (river and 

 seolian) of portions of these sandstones 

 were given, and further evidence presented 

 which seems to indicate that part of the ac- 

 cumulation of these sands began in Ordo- 

 vicic time. 



Paleogeography of the American Devonic: 



Charles Schuchert. 



A series of lantern slides was shown, il- 

 lustrating the relation of the seas and lands 

 of Helderbergian, Oriskanian, Onondaga, 

 Hamilton and Chemung times. 



Carboniferous of the Appalachian Basin: 

 John J. Stevenson. Read by title. 



Coal Measures and Higher Beds of South 



Brazil: I. C. White. 



The author showed that a great system 

 of rocks (the Santa Catharina system) 

 exists in South Brazil, covering large areas 

 in the states of Rio Grande do Sul, Santa 

 Catharina, Parana and S. Paulo, entirely 

 comparable to the Karroo system of South 

 Africa. Also that, like South Africa, 

 Brazil had its Glacial epoch succeeding the 

 deposition of the Coal Measures, the 

 'Dwyka' and 'Talchir' conglomerates of 

 Africa and India being paralleled by the 

 Orleans conglomerate of South Brazil; 

 that the Brazilian Coal Measure flora, as 

 described by Mr. David White, is the same 

 as that of the Coal Measures in South 

 Africa, India and other southern regions 

 during Permian time, and also that the rep- 

 tilian fauna, as described by Dr. J. H. Mc- 

 Gregor and Dr. A. Smith Woodward, is 

 the same as that characterizing the South 

 African beds. In other words, that the 

 ' Gondwanaland ' of the Indian geologists 

 not only extended into Africa, but crossing 

 from the latter into South America, most 

 probably encircled in a broad belt the entire 

 southern hemisphere. 



Permo-carboniferous Climatic Changes in 

 Brazilian South America, as indicated by 

 Fossil Plants: David White. 

 The paper presented the conclusions, 

 drawn from a study of the fossil plants, 

 respecting Permo-carboniferous glaciation 

 in Brazil, subsequent Permian climatic 

 changes, and probable geographic rela- 

 tions of the southern portion of the con- 

 tinent, both to the Indo-Africo-Australian 

 ' Gondwana Land ' and to the northern 

 land masses. 



Structure of the Deep Biver Triassic : Col- 

 lier Cobb. Read by title. 



Bed Beds of Oklahoma and Adjacent 

 States: Charles Newton Gould. Read 

 by title. 



Stratigraphic Eelaiions in Central Wy- 

 oming: N. H. Darton. Read by title. 



Correlation of the Triassic Trap Bocks of 

 New Jersey: J. Volnet Lewis. Read 

 by title. 



Pleistocene Glacial Phenomena of the Bo- 

 livian Plateau : W. G. Tight. 

 The paper described the topography and 

 glacial deposits in the vicinity of La Paz, 

 and the Cordillera Real cast of the Lake 

 Titicaca basin, and established the fact that 

 in Quaternary times the Bolivian plateau 

 region was subjected to three distinct 

 stages of glaciation with well-marked inter- 

 glacial periods. The paper also described 

 the characters of the great basin south of 

 the lake Titicaca region which was the floor 

 of a very extensive glacial lake. The old 

 beaches occur in three sets which are cor- 

 related with the three stages of glaciation 

 of the plateau. 



Preglacial Drainage in the Mississippi 

 Valley, A Working Hypothesis: W. G. 

 Tight. 

 The hypothesis proposes that the present 



Mississippi, Ohio and Missouri drainage 



