








44 REVIEWS. 
The prevailing colors are white, pink, — sometimes playing into orange, 
— and a pale green. Blue was only seen in a small incrusting sponge. 
sea animals have generally well- hebes eyes, larger if anything than ` 
those of their congeners of shallow wa : 
THE GEOLOGICAL SURVEY OF ILLINOIS.* — Prof. Worthen announces — 
that the M system attains a maximum of 2500 feet in this - 
State, and contains ten seams of coal, six of them in the É, d à 
whois series is exposed in the banks of die Tllinois, which cuts dit í 
across these beds for more than a hundred miles from north-east 
est. 
to bé 1 à very serious mistake in Prof. Owen's estimate of the thickness 
c 
Sandstone," in the Kentucky section, are identical. If this 
series of coal seams between the latter and the former, do not overlie the 
in the same geological horizon. ‘The product of our coal mines for the 
past year (1867) according to the most reliable statistics, is fully 1500000 
tons." ‘There is, perhaps, no other area of equal extent in the United 
They are Alexander, Union, Jackson , Perry, Jersey, Greene, Scott, Was 
ington, Clinton, Marion, Jefferson, Coat, and La Salle Counties. 



