Woopworrtu.— Geological Expedition to Brazil and Chile. 
PLATE 15. 
Sketch map of the geology of south Brazil, based upon surveys by Dr. 
Orville A. Derby, Dr. I. C. White, the publications of Dr. J. C. Branner, 
and upon field observations by Dr. Euzebio P. de Oliveira and the writer. 
The boundary of the trap sheet and consequently of the sedimentary area 
about Lages in Santa Catharina is drawn without any claim to approximation 
of its true position on the south, and the eastern limits of the effusive trap 
sheets in western Sao Paulo and northern Parand4 are likewise indefinite. No 
attempt is made to delineate the numerous exposures of intrusive sheets 
giving rise to the ferra roxa of Sio Paulo and northern Parand. Page 41. 
