82 BULLETIX: MUSEUM OF COMPARATFV'E ZOOLOGY. 



dence of an eastern origin for the glacial debris points to this latter 

 mode of deposition rather than to the first above outlined. 



Our knowledge of the Permian of south Brazil is limited to the 

 narrow belt from which the overl;ynng supposed Triassic beds have 

 disappeared by erosion. The Permian is not represented as reappear- 

 ing on the western flank of the broad shallow syncline which subtends 

 the structure as far west as Cuyuba in Matto Grossjo but it is probable 

 that the Permian extends far beneath the Triassic cover. 



Boulder-Beds uf the Argentine Republic. — The brief references of 

 Bodenbender (1895) to the occurrence of boulder-bearing beds be- 

 neath the Gondwana flora in the provinces of San Luis and Mendoza 

 in central Argentina may be presimied, though this geologist does not 

 infer their glacial origin, to indicate an extension of the Brazilian 

 Permian geographic conditions to the south and west quite to the 

 base of the Andes, thus practically carrying the peculiar geographic 

 and climatic features of the Permian across the continent of the 

 southern hemisphere from one shore of the Pacific Ocean to the other. 

 Details concerning the agency concerned in the transportation of 

 these Argentine deposits is as yet lacking and until the precise facts 

 on this point are known it would be presumptuous to draw further 

 conclusions from the deposits concerning the glacial problems of 

 the South American Permian. 



Boulder-Beds of the Falkland Islands.^ [Mr. Thorre G. Halle (1911, 

 p. 115-229) reports the existence of a boulder-bed and typical 

 tillite with striated jflat-faced pebbles at the base of a Permo-Carboni- 

 ferous series on East Falkland Island. Higher up in the section occur 

 Glossopteris, Gangamopteris, Phyllotheca and other members of the 

 Gondwana flora. 



The occurrence of glacial deposits in south Brazil and on the Falk- 

 land Islands carries with it the presumption that the boulder-beds 

 beneath a Gondwana flora in Argentina are also glacial in origin 

 whether or not they nov; show striae, which latter may yet be found 

 on the small rock fragments. 



Gondicana-land. Did it include Parana-landf — Palaeogeographers 

 reljang largely upon the distribution of the fossil genera Glossopteris, 

 Gangamopteris, and their plant allies of Permo-Carboniferous times 

 ■with the associated glacial boulder-beds have gradually extended the 

 name Gondwana-land from its original application to the Indian 

 South African area so as to include the South American tracts in 

 which traces of the Gondwana flora occur. To a certain extent the 

 name has thus become designative of a set of geographical conditions 



