THE NORMAL CURVE 63 



7201-7357. — Continued 



7307, at locality 73, measures */i inch (1 cm.); at 82, i^i 

 inches (3.5 cm.); at 84, 2>£ inches (6.5 cm.); at 85, 

 27>£ inches (70 cm.); at 86, 2}4 inches (6.5 cm.); 

 at 88, 2 inches (5 cm.); at 89, 2^i inches (6 cm.); 

 at 91, Y% inch (2.3 cm.). At localities 84 and 85 

 the varve consists of quicksand and coarse sand 

 respectively, at 86 of sand and silt, and at the 

 other localities of silt and clay. 



7314, at locality 73, measures yi inch (1 cm.); at 82, 3^ 

 inches (9 cm.); at 83, io>^ inches (26 cm.); at 84, 

 S}4 inches (13 cm.); at 85, 5^ inches (14 cm.); at 

 86, 4>£ inches (10.5 cm.); and at 88 and 89, 3^ 

 inches (8.5 cm.). At locality 85 it consists largely 

 of sand, at 83, 84, 86, and 88 of sand and silt, and 

 at the other points of silt and clay. 

 7358-7400. — Somewhat uncertain because the varve limits are 

 very difficult to distinguish. 



7399 begins a series of comparatively thick varves con- 

 sisting of exceedingly greasy clay. 



