46 bulletin: museum of comparative zoology. 



and Santa Catharina. The best defined horizon is described as that 

 of the Estrada nova shales with flint concretions. So far as I could 

 ascertain in 1908 the Glossopteris flora and beds of coal are only well 

 known on the south in Santa Catharina while deposits with fossil 

 trees are found on the north in Sao Paulo. The typical tillite beds 

 are at present best known and apparently most extensively developed 

 in the state of Parana. On the north in Sao Paulo only scattered 

 stones occur in the beds. On the south in the Tuberao Valley no 

 tillite beds are found but waterworn conglomerates occur. Farther 

 south and west in Rio Grande do Sul some of the reports mention 

 boulders near the base of the section which may be presumed to 

 indicate Permian ice-action, but tillite has not been described from 

 there. Heretofore the Permian has shown only non-marine organic 

 remains but the discovery of a sparse marine fauna in black shales 

 near Rio Negro intercalated in the boulder-bearing beds demonstrates 

 the at least temporary invasion of the district by the Permian sea. 

 The sections traversed by the writer in Sao Paulo between Itaicy and 

 Piracicaba, in Parana between Ponta Grossa and Conchas on the 

 Tibagy, between Lapa and the base of the Serra do Espigao, and in 

 southeastern Santa Catharina along the Tuberao Valley, seem to 

 bear out the above statement as to considerable variation in the 

 character of the sediments from point to point in the lower portion 

 of the series. The following letter shows the progress of the geological 

 survey up to 1912. 



Ponta Grossa, 13 de Dezembro de 1911. 

 Meo caro Dr. Woodworth. 

 Saude. 



.... Estou aqui prosequindo os meus trabalhos e como sei que as suas 

 observacoes no Brasil ainda nao estao publicadas aproveito esta para Ihe dar 

 algumas indica5oes sobre a idade dos conglomeratos glaciaes. 



A primeira vez que encontrei camadas com fosseis marinhas em conglomer- 

 atos glaciaes foi quando eu estava executando a sondagem do Passinho a 

 12 km. ao sul de Imbituvo. Estas camadas foram encontradas a partir de 

 120 metres de profundidade; tinham 45 metres de espessure e nellas achamos 

 uma pequena lingula, escamas de peixes, e restos indeterminados de brachio- 

 podos e lamellibranchios. A partir de 160 metres de profundidade a sondagem 

 atravessou ate 395 metres exclusivamente camadas argillosas, sem estrati- 

 ficagao, com pequenos seixos, e algumos boulders de granite. Em 1908, na 

 sua companhia descobrei a camada fossilifera do Rio Negro. E' um schisto 

 negro, ardoriano, com Lingulas, Discina, peixes e restos de esponjas. Em 

 Outobro deste anno consequi identificar as camadas da sondagem do Passinho. 

 Ellas apparecem no grotao leste de T. Soares, 45 metres abaixo do arenito 



