HOVEY : ARTESIAN WELL AT KEY WEST. 69 



825 feet. The remainder is more sandy, with well rounded grains, but 

 contains some angular fragments of amorphous rock (e. g., 975 feet). 

 All is more or less oolitic. The quartz sand is present only as a trace, 

 and sometimes (975 and 1,000 feet) is scarcely perceptible. Most of the 

 samples from these depths are notably fossiliferous, foraminifera and 

 lamellibrauchs predominating. From 900 feet down bits of madrepore 

 corals were noted in the samples, and such fragments were rather nu- 

 merous at 1,000 feet. 



1,100 to 1,175 feet. — Light gray limestone, partly dense and partly 

 porous in texture, containing only a slight trace of the quartz sand. 

 Somewhat oolitic at 1,175 feet. Foraminifera abound, though they are 

 somewhat less numerous in the lower than in the upper half of this set. 

 Bits of coral, also, are more numerous in the upper half than in the 

 lower. The fragments in the sample from 1,125 feet indicate the pres- 

 ence of comparatively large lamellibrauchs. Remains (casts) of gastro- 

 pods are more numerous at 1,150 feet and 1,175 feet than in most of 

 the samples. 



1,200 to 1,350 feet. — A gray sand-rock with the 1,200 foot sample a 

 transition to that above, but in all the set there are many angular bits 

 of dense and porous limestone among the rounded grains indicating the 

 sand-rock. The quartz sand is pi'esent in all, but in the sample from 

 1,250 feet there is more than in any other for 350 feet above it and all 

 the rest of the distance to the bottom of the boring. Fossils are 

 rather scarce in this set, even foraminifei'a being numerous only in the 

 three samples 1,275, 1,300, and 1,325 feet. Coral fragments come next 

 to the foraminifera in abundance, but are very few in 1,300 to 1,350 

 feet. From 1,250 to 1,350 feet the rock is somewhat oolitic. 



1,375 to 1,450 feet. — A yellowish gray sand-rock containing some 

 porous limestone (much at 1,400 feet) and a little dense rock, but be- 

 coming a fine, closely compacted sand at 1,450 feet. Textularias of at 

 least two species appear at 1,375 feet, and are persistent in most of the 

 samples from this point to the bottom of the boring and outnumber the 

 Orbitoides at most depths. Aside from the foraminifera very little is de- 

 terminable, most of each sample except that from 1,400 feet being so 

 finely comminuted as to pass through the No. 40 mesh sieve. Of quartz 

 sand there seems to be none at 1,375 feet, and only a trace at the other 

 depths. Ovules and bits of oolite are not numerous. There is some 

 iron stain at 1,450 feet. 



1,475 to 1,975 feet. — Sand-i'ock varying somewhat from one depth to 

 another in color, compactness, and amount of contained dense and porous 



