Woopwortx.— Geological Expedition to Brazil and Chile. 
PLATE 2. 
GRANITE BOULDERS DUE TO WEATHERING. 
View on the shore of Florianopolis Island, Santa Catharina; on shore of bay 
south of the city of Florianopolis. This type of surficial boulder, due to 
secular weathering of the granite, is common in the granitic regions along the 
slopes and at the base of the Serra do Mar, particularly at sea-level. The 
well-known boulders of the ‘‘ Furnas das Agassiz’ at Tijuca, which with other 
phenomena gave rise, at the time of the Thayer Expedition to Brazil, to the 
now abandoned hypothesis of the glacial origin of these detached blocks, 
belong in the same class of effects of secular weathering since Tertiary times. 
Page 113. ; 
