206 E. B. Hunt on the Florida Reef. 
report the same impression. During the growth of two hundred 
and forty miles of keys there has been then no observable change 
of level. There is a dead fringing reef forming the Punta, or 
west angle of the entrance to Havana, which seems to have been 
elevated some six feet, and this is the only case of recent eleva 
tion in this vicinity with which I am acquainted. 
Prof. Tuomey and Prof. Agassiz fully identify the formations 
at Fort Dallas with the rocks of the keys. The former reports 
If a mile to three miles. There is thus a very gentle rise 
throughout the peninsula, and in the general slope sweeping the 
north margin of the Gulf and South Atlantic. : 
The existence of abundant fossil corals in the Tertiary lime 
stone strata of two hundred to three hundred feet thick, sprea® 
ing from the Mississippi river around to Cape Fear river @ 
North Carolina, indicates an ancient coral origin.’ Prof. Tuomey 
was led by these evidences to a special examination of the Flor. 
ida Reef, from which he concluded that a continuous process ¢ 
* Assistant F. H. Gerdes, U.S. Coast Survey, found the surface of the water ™ 
the Everglades to be 6 ft.24 inches above low water-mark at Fort Dallas: 8° 
Coast Survey Report for 1849, p. 47. 
* There are corals in the Tertiary of the coast, but no continuous reef-rock, We 
believe, warranting the above remark. many muddy streams have been 9 was 
way of the extensive formation of coral reefs on these coasts, even when, 2s iD 
Tertiary, the temperature of the ocean favored it.—Eps, 
