Sellards — Comanchean Formation. 15 



well near Tallahassee (well No. 2) Comanchean fossils 

 are recognized at the depth of 325 feet, although the for- 

 mation may extend much nearer the surface. The eleva- 

 tion at this well is 20 or 25 feet above sea-level. At 

 Jacksonville, well No. 3, Comanchean fossils appear at 

 820 feet. Here again the formation may extend to a 

 higher level, although not above the 550-foot level as 

 samples from that depth contain Eocene fossils. The ele- 

 vation at this well is 10 or 15 feet above sea-level. In 

 wells number 4 to 11, located in central peninsular Flor- 

 ida, the Comanchean, when recognized, is found coming 

 to a much higher actual level than at Jacksonville. At 

 Anthony in Marion County, the Comanchean is recog- 

 nized in the 110-foot sample (well No. 5). The ground 

 level at this well as indicated by the topographic map is 

 about 80 feet above sea. Hence, the Comanchean here 

 comes to within about 30 feet of present sea-level. At 

 Apopka, well No. 8, Comanchean fossils were found in 

 the 115-foot sample. According to levels obtained from 

 the Atlantic Coast Line Railway, the depot at Apopka is 

 125 feet above sea, and the well is said by Mr. Hull who 

 preserved the sample, to be about 8 or 10 feet above the 

 depot. From this approximate data it appears that the 

 Comanchean at this place rises somewhat above sea-level. 

 The samples from two wells at this place contain phos- 

 phate pebbles to the depth of about 220 feet. Since the 

 Comanchean is not observed to contain phosphate pebbles 

 in any of the other wells it seems probable that the phos- 

 phate pebbles had fallen from a higher level and that the 

 samples are thus mixed in both of the wells to about that 

 depth, notwithstandng that casing was placed in one of 

 the wells at 117 feet and in the other at 127 feet. If the 

 mixing of samples is due merely to material falling in 

 from above, the observations as to the level of the Coman- 

 chean formations are not thereby affected. Farther to 

 the south, at Tiger Bay (well No. 11), the Comanchean is 

 first recognized at 550 feet, the surface elevation at the 

 well being probably between 125 and 150 feet above sea. 

 On the Atlantic Coast, at St. Augustine (well No. 4), the 

 Comanchean is recognized at the depth of 440 feet and 

 may extend somewhat nearer the surface. It is thus seen 

 •that in central peninsular Florida the Comanchean for- 

 mations, as identified on the basis of these fossils, rise 

 almost to present sea-level, possibly above in places. 



