48 FLORIDA GEOLOGICAL SURVEY-SEVENTH ANNUAL REPORT. 
665 feet. A limestone breaking into coarse fragments. The predominating fos¬ 
sil is a small flat echinoderm, the internal cavity of which is in most cases 
filled with calcite crystals. Foraminifera are also present, although not 
numerous. 
670 feet. A compact limestone with slightly brownish cast. The same small 
flat echinoderm is present, although broken up by the 1 drill, and is not 
abundant. Foraminifera are present, although not abundant. 
680 feet. A brown limestone rather hard but not very compact. Few if any 
fossils are preserved. It is probable that the minute fossils in the rock have 
dissolved out, and the cavity partially refilled by calcite crystals. This gives 
the rock a porous and partially crystallized appearance and causes it to 
break into medium coarse fragments by the drill. 
690 feet. The material is chiefly light brown or grayish brown porous lime¬ 
stone partially crystallized, the fossils having been destroyed. With this 
is included light colored rock. 
710 feet. This sample consists chiefly of soft white limestone in which is in¬ 
cluded a few foraminifera. A limited amount of the harder brownish rock 
from the stratum above is present. 
720 feet. A light colored, rather hard, although porous, limestone which stems 
to be made up of a mass of broken shells and other fragments of fossils. 
One small flat echinoderm present, although broken. 
740 feet. White granular limestone. Fossils not numerous, although a few 
foraminifera are seen; also broken pieces of a small flat echinoderm. 
760 feet. Grayish brown limestone, rather hard and partly crystallized. A few 
fossils, including a small gastropod. 
770 feet. Grayish brown limestone, rather hard and partly crystallized. Few, 
if any, fossils. 
790 feet. The greater part of the material of this sample is brown or grayish 
brown powdered up by the drill medium fine. With this are several large 
pieces of ground rock which consists almost entirely of a mass of small 
calcite crystals. The sample contains also some light colored material in¬ 
cluding a few foraminifera. 
800 feet. The material of this sample is similar to that of the last. The large 
fragments consist chiefly of a mass of small calcite crystals, the mass being 
brown in color. 
814 feet. The rock at this depth is not unlike that at 800 feet, although it is 
darker in color, being very dark brown, somewhat compact and partly crys¬ 
tallized. 
820 feet. A light colored limestone which powders up medium fine in drilling. 
Foraminifera present. 
830 feet. A light colored limestone which powders up medium fine in drilling. 
Foraminifera present, although not abundant. 
838 feet. The greater part of this sample is white and rather soft limestone; 
