108 
FLORIDA GEOLOGICAL SURVEY-I4TH ANNUAL REPORT 
Depth from, surface. 
Limestone, granular, light gray..... 226-240 
Sand, fine, gray, gray granular limestone, and wine-colored silex.. 240-260 
Marl, fine, gray, sandy, with wine-colored silex_____ 260-280 
Limestone, fine, gray, sandy...... 280-338 
Sand, light gray .... 338-350 
Limestone, porous, white..... 350-360 
Limestone, coarse grained, gray.... 360-375 
Limestone, yellowish gray, containing some chert......... 375-388 
Limestone, gray, containing chert............. 388-420 
Chert, dark gray ............. 420-425 
Limestone, light gray........... 425-431 
Limestone, white .|.... 431-470 
Limestone, pinkish gray .......... 470-490 
Limestone, very fine grained, dense, white_____ 490-508 
Limestone, coarse grained, brownish gray_______ 508-525 
Limestone, light gray ....... 525-575 
Limestone, medium grained, light gray. . 575-590 
HOLMES COUNTY 
Holmes County, in west Florida, adjoins the Alabama-Florida state 
line. On the Choctawhatchee River, near the Alabama boundary, is 
found an exposure of Ocala Eocene.* Downstream from this exposure 
to or nearly to the Louisville and Nashville Railroad crossing, are occa¬ 
sional exposures of Upper Eocene or Lower Oligocene limestones. In 
the southwestern part of the county the Alum Bluff Miocene, repre¬ 
sented by shell marls, come into the section. 
No deep wells have been drilled in this county. The underground 
conditions are probably not unlike the conditions encountered by the 
Chipley well in Washington County. 
JACKSON COUNTY 
Jackson County adjoins the Alabama-Florida state line west of the 
Apalachicola River. On the Chipola River, in this county, the Eocene 
and Oligocene limestones, Ocala and Marianna formations, are found 
at the surface for several miles south of Marianna. 
In the southern part of the county on the Chipola River, and in the 
eastern part of the county on the Apalachicola River the Chattahoochee 
limestone (Oligocene) is at the surface. In the southwestern part of the 
county the Alum Bluff formation is found at or near the surface. 
Jackson County is located on the structurally high area extending 
into Florida from Alabama and Georgia. The dip of the formations is 
probably southeast and south. 
'^Identified by C. Wythe Cooke, U. S'. Geol. Surv. letter March 29, 1922. 
