woodworth: geological expedition to brazil and chile. 63 



West from Sengens on the north of the Rio Jaguaricatu in one of 

 the deep cuts along the ascending grade striated stones were first 

 found in Brazil. The bed exposed at this locality is a tj^pical tillite, 

 containing large subrounded masses of a whitish rock resembling the 



Fig. 13. — Section along the railway showing white novaculitic sandstone 

 bed under tillite bed. 



white, fine, silicious sandstone from near the base of the Permian 

 section. 



This occurrence of the fine white sandstone in the boulder-beds from 

 Sao Paulo southward in close association with the preglacial stratum 

 of the same character is strong evidence of the eastern derivation 

 of the erratics. 



Conglomerates at Ponia Grossa: — Overlying the trap-invaded fossili- 

 ferous Devonian shales which underlie the "big point" between 



w 



/ £^<^T7', ' . ' V^'-mI^ izis-s^ ' 



Fig. 14. — Section of Permian conglomerate beds in vicinity of Ponta 

 Grossa, Paran4. 



streams on which the city of Ponta Grossa stands, there are to be 

 seen on the northwest of the town near the base of the Permo-Car- 

 boniferous series, at least two beds of waterworn conglomerate (Fig. 

 14) interpolated in a thick sandstone series. These waterworn 

 pebbles present in themselves no evidence of glacial origin or trans- 

 portation. The lower pebble bed, from four to five feet thick, is made 

 up of subangular to well rounded, waterworn, light-colored sandstone 

 pebbles from .5 inch to 6 inches in diameter. Rarely larger cobble- 



