248 Tlic American Geologist. April, 1899 
penetrate with a pick. This property leads to a considerable 
use of the material in the construction of chimneys, the soft 
clay being trimmed into blocks with an ax and exposed to the 
weather for a few weeks or months, during which time it be- 
comes hard and very tough. 
Stevens Pottery Clay. This clay occurs at a town known 
as Stevens Pottery, which is situated in Baldwin county, on a 
branch of the Central R. R., and which received its name on 
account of the clay manufacturing plant of Stevens Brothers, 
located there. The firm which consumes the clay is the largest 
producer of sewer pipes and pottery in the state. 
The clay occurs much as at other points along the fall line, 
but as a rule carries a considerable amount of impurities in 
spite of which, however, it is more readily- used for manufact- 
ure into conmion wares, it being more plastic and more sus- 
ceptible to burning, although as a fire clay it fuses at a slightly 
lower temperature than the high-class, refractory clays found 
at other points in the Cretaceous belt. 
Summit. This clay occurs at a point about six miles north- 
west of Griswoldville and somewhat north of the fall line. It 
is part of an outlier of Tertiary strata resting on greatly dis- 
torted crystalline schists, which are here cut by a thick, fine- 
grained diabase dike. 
• The elevation of the occurrence is about two hundred and 
fifty feet above the Macon bridge. The clay beds are exposed 
in the railroad cut to a depth of thirty feet or more. They have 
a bluish and greenish color, and in places are densely packed 
with shell fragments which furnish a large amount of the 
calcite shown by analysis. to be present. The clay is capped 
by the omnipresent beds of Lafayette gravel. The material 
which was analysed and tested was free from fossil remains. 
Fitzpatrick . Fitzpatrick is a station on the M. & D. R. R. 
about ten miles southeast of Macon. 
The clay selected for study from this locality was taken 
from stratum No. 5 of the following section: 
Yellow soil, grading downwards into red sand 10 to 12 feet 
Laminated clay 5 feet 
3. Fine sand with carbonaceous layers (2 to 3 inches thick) . . 6 feet 
4. Grayish laminated clay 4 feet 
A white to cream colored clay which dries to a hard 
punky condition, is exceedingly tough and can be cut 
