PLATE 12. 
The gorge of the Iguassti at Serrinha, Parand, west of Curityba. The 
Iguassti after leaving the baselevelled region about Curityba flows for several 
miles across the sandstones and boulder-beds at the base of the Permian 
system. The basal beds are regarded by some Brazilian geologists as possibly 
Devonian. Page 65. 
