92 
FLORIDA GEOLOGICAL SURVEY-I4TH ANNUAL REPORT 
Depth in feet. 
Light-colored limestone consisting of shell fragments with an abundance 
of black phosphate pebble and with small fragments of the sandy marl 
with slightly green shade of color..... 500 
A somewhat harder limestone, containing, however, phosphate pebble. 520 
Limestone similar to that at 520. This limestone is not so light in color 
and does not contain so many shell fragments as the limestone above 
320 feet . ....... 540 
Very fine, siliceous and calcareous sand containing minute black phosphate 
pebble .:...:... -,._2 .-. 1 . 600 
Same as 600 ...... 640 
Similar finely powdered material containing, however, less quartz sand... 680 
Limestone with slightly brownish color and finely powdered by the drill... 720 
Finely powdered calcareous material similar to that at 600 feet..__ 760 
Light-colored limestone consisting of a mass of broken fossils. ...... 800 
Same as at 800 feet....E,.....JBi. 2 E....... 840 
Same as at 800 feet....._______________ 880 
Finely powdered rock including fine quartz sand, much like that at 600 
feet...... 900 
Limestone consisting of a mass of broken fossils.. 8 H@|. 950 
MIAMI AREA 
A well drilled at Miami, and recorded under the discussion of Dade 
County, will serve to illustrate drilling conditions as found on the At¬ 
lantic Coast of southern Florida. In this part of the state the regional 
dip of the formations is to the southeast. Hence, in passing to the north 
and west any given formation may be expected at a somewhat lesser 
depth than at Miami. 
Following is the log of a well drilled at Palm Beach, about sixty-five 
miles north of Miami d 
Log of Well of C. I. Craigin, Two and a Quarter Miles North of Palm Beach. Well 
Drilled 1889-1890 by J. A. Durst 
Depth in feet. 
Surface soil ... 0-5 
Rock . 5 - 7 
First sand...H..... 7-8 
Mostly fine coquina rock............ ... 8 - 36 
Quicksand and sharp pieces of stone... 36 - 57.2 
First really hard rock...... 57.2 - 58 
Coquina, alternating with sandy strata....... 58 - 76.10 
Hard rock ......... 76.10- 78 
Very hard flint .I... 78 - " 78.6 
Sand, white and solid, but not hard....... 78.6 - 84 
Quicksand bed, mixed with bits of coarser material. 84 - 96 
Flint rock, thin .. 96 - 96.6 
Fine sand ..........ML...... 96.6 - 97 
Quicksand bed . 97 - 148 
iFla. Geol. Surv., 5th Ann. Rept., pp. 274-276, 1913. 
