AGASSIZ: THE FLORIDA ELEVATED REEF. 59 



similar to those seen elsewhere ; even on the supposed Long Key no 

 pines could be seen, as would be expected if the foundation reached 

 high-water mark. I assumed, therefore, that the difficulties involved in 

 going farther west would not be repaid by any new results, and accord- 

 ingly returned to Cocoanut Grove. 



A number of sections shown in natural and artificial wells about 

 Cocoanut Grove were examined. Everywhere the evidences of bedding 

 were clear. In the deepest section, however, about sixteen feet deep, 

 stratification became obscure toward the bottom, and the material, in- 

 stead of being uniformly fine grained, contained numerous small frag- 

 ments of coral. It would seem as though the reef must be near at 

 hand. The ordinary fine grained limestone appears oolitic, and a small 

 quarry offers clean specimens that show this structure well. 



Thinking that some notes on the northern extension of the oolite along 

 the east coast of Florida would be of value, I made a few observations 

 on my way north. At Lemon City, twelve miles north of Cocoanut 

 Grove, the rock may be identified at the boat landing. It is thrown up 

 along the canal ten or twelve miles north of Lemon City. 



At Xew River, thirty miles north of Cocoanut Grove, another section 

 was made into the Everglades. In a day's trip a point sixteen or eigh- 

 teen miles from the coast was reached ; lack of water prevented further 

 progress. Sounding through mud five feet failed to give rock bottom, 

 and the last rock noted was perhaps twelve miles from the coast. The 

 rock was similar to that farther south. 



About thirty miles north of New River, at Linton, another examina- 

 tion was made. A cross-bedded fragmental rock was abundant, but con- 

 tained considerable quartz. Coquina w r as also abundant, and the two 

 rocks were found interbedded. 



At Palm Beach and vicinity the coquina and fine fragmental rock 

 also occur closely associated : the coquina perhaps predominates. This 

 is about twenty miles north of Linton. At the last two localities in- 

 quiries gave no encouragement to inland exploration. 



A trip to Cape Canaveral disclosed there a rock which may well rep- 

 resent the fine fragmental rock of Palm Beach and Linton. The 

 quantity of quartz is greater, the quartz grains are larger, and the rock 

 less coherent than to the south. 



VOL. XXVIII. — no. 2. 



