SECOND ANNUAL REPORT—STRATIGRAPHIC GEOLOGY. 
103 
thanlax different from that found in St. Domingo or the Tampa “Or- 
t haul ax bed/’ a rich development of the genus Marginella, a species 
of the group of Oliva called by von Martens Omogymna, a species of 
Spheniopsis, heretofore only known from the European Oligocene, 
these are among the interesting features of the fauna.” 
According to Dali 1 the “Sopchoppy limestone” contains orbitolites 
and ‘‘about thirty species of shells, most of which are common to the 
Chipola marl or the Orthaulax beds.” Judging from the presence of 
fragments of bones occurring in this limestone at some localities, a 
vertebrate fauna of considerable size is doubtless represented, but no 
attempt has been made to procure collections, and hence its char¬ 
acteristics are unknown. 
“This group of species is distinctly subtropical, but less indicative 
of warm seas than the Bowden marl of Jamaica, with which the Chip¬ 
ola beds.have sixteen species in common. Only one species is known 
to be found both in the Chipola beds and the Oligocene of St. Do¬ 
mingo. About half the species in the Chipola marl are peculiar to it, 
and of the others the largest percentage is found in the Tampa silex 
beds, while in the subsequent Oak Grove sands twenty-four per cent, 
of the Chipola species occur. Thirty-five species survive to the exist¬ 
ing fauna.” 
The type locality of the Chipola marl member is the McClelland 
farm, which is situated on the west side of the Chipola River just 
south of Ten-Mile Creek. Here the marl was formerly mined, but at 
the present time the pit is covered with sand and debris, so that the 
deposit can only be reached by digging. The section given by Dali 2 is: 
Superficial sands, 1 to 3 feet, say... 2 feet. 
Chipola marl, varying from ........ 7-12 feet. 
Chattahoochee limestone at water’s edge, extending below not less than 6 feet. 
Total thickness ....... 20 feet. 
The marl is exposed on the north bank of Ten-Mile Creek, where 
it attains a thickness of six to twelve feet, and is underlain by the 
Chattahoochee formation which is exposed at a natural bridge two or 
three hundred yards farther down stream. At this locality the marl 
has the same general characteristics as in McClelland’s marl pit. Other 
small exposures are reported on the Chipola River near the McClel¬ 
land farm, and at the base of Alum Bluff. 
1 Dali, Wm. H., Neocene of North America, U. S. Geol. Survey Bull. No. 84, 
1892, p. 120. 
2 Dali, Wm. H., Geol. Soc. Am. Bull., vol. v, 1893, p. 159. 
