BRANNER: THE STONE REEFS ОЕ BRAZIL. 83 
along the beach between Gamella and Guadalupe. The section and 
geologic relations of these beds are shown in the sketch on p. 30. 
ZN 
7 ate e 
елу еы 
n 
'* 
STONE “CORAL 
ЕЕ 
Ла 
Moulfy of 
“Rio ЖО? 
{Сз 
a Scale. ante 
5 нА... t- 4 
[Е.. of Rio de Janeiro x 3 Kilometer 
Ете. 51. The dotted line on the north 
side of the mouth of the river shows the 
position of the shore in 1875; the sol 
id line to the west shows the shore in 1899. 
Pure white (ПАШ ай dns "laor out 
Black soft sandstone 8 
Yellow clay seam Den, 17-977 
White soft sandstone . . . . у o 
Blue sandy clay at base... . е 
1 These white quartz sands are well adapted to the manufacture of glass. The 
bed in places is four metres thick, but for most of the dista 
nee from Gamella to 
where the sands abut against the Guadalupe Tertiary hill, they have been blown 
