WooDWORTH. — Geological Expedition to Brazil and Chile. 



PLATE 20. 



Boulder of Pre-Permian Conglomerate in Permian sandstones near 

 Villa Rafford Station, Sao Paulo. 



This boulder lies in the decomposed glacial sands of the railway cut between 

 kilometer posts 199 and 200 west of the railway station. It is composed of 

 quartzite pebbles unlike any portion of the Permo-Carbonif erous or Devonian 

 series known to me in this district. There is a specimen in the collection of 

 the Museum at Sao Paulo, said by Dr. Pacheco to be identical with this rock, 

 which has all the characters of a basal conglomerate of a marine series of Pre- 

 Devonian age, possibly to be located in the metamoiphosed sedimentary belt 

 on the east of the area in which these fragments have been found. Page 57. 



