SECOND ANNUAL REPORT—STRATIGRAPHIC GEOLOGY. 
57 
Near the east edge of the town of Marianna there is a small ex¬ 
posure which affords the following section: 
SECTION No. 1. 
Red, sandy clay, with some beds of sand and gravel, Lafayette. 25 ft. 
Marianna limestone: 
White, marly clay ..... 5 ft. 
Hard, earthy, gray limestone .. 2 ft. 
Blue marl with many Pectens . 8 ft. 
Hard gray limestone .... 4 ft. 
Approximately twenty feet below this is section No. 2. 
SECTION No. 2. 
Hard, gray limestone, very fossiliferous, Orbitoides mantelli, Pecten 
poulsoni, etc..... 5 ft. 
Dark gray chert . 4 in* 
Soft, porous, white limestone, with a few Orbitoides and other fossils... 30 ft. 
The white limestone of this section is exposed in a quarry where 
it is obtained by sawing. It is used locally for building purposes, 
especially in the construction of chimneys; upon exposure to the 
weather the rock hardens until it resembles the hard member at the 
top of the section. 
A well drilled at Marianna penetrated limestone, marl and clay 
to the depth of 265 feet, where a bed of quicksand was encountered. 
An incomplete log of this well is given below: 
Sand and sandy loam, Pleistocene .. 1^4 ft. 
Red and yellow sandy clay and sand, Lafayette. 20 ft. 
Alternating beds of hard limestone and marl. 45 ft. 
(This doubtless includes section No. 1 at the east end of the town.) 
Hard rock (chert) followed by alternating beds of marl and limestone 
with some chert, Marianna (?)..... 200 ft. 
The log of this well does not afford any means of judging at what 
depth the base of the Marianna limestone was reached, but it is pos¬ 
sible that an underlying formation was penetrated some distance above 
the quicksand. 
At a locality two and a half miles southeast of Chipley, the Mari¬ 
anna limestone outcrops in the edge of a sink; and about six miles 
southwest of Chipley and one mile north of Duncan it is exposed in 
some small quarries where it had been obtained for building purposes. 
At one of these quarries belonging to Mr. F. G. Owens, the rock has 
also been burned for lime, which was reported to be of good quality. 
This quarry shows about twenty feet of porous, white limestone, re¬ 
sembling the rock in section No. 2 at Marianna. Near the surface it 
is very hard and durable, but at greater depth it becomes much softer. 
Fossils occur throughout the entire section, but are especially 
numerous in the upper five feet, where the rock appears to be largely 
