GEOLOGY OF GILES COUNTY, VIRGINIA 
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directions. The layers are two to six feet in thickness. About 
six feet from the base, there is a two foot layer which is con- 
siderably darker than the rest of the division. Weathers light 
buff to white but does not bring out the bedding. The fracture 
is conchoidal with coarse patterns. Joints are rare and small. 
No fossils seen. Dolomitic. 20 feet. 
3. Color as in one and two — fine grained, crackled and hackly, 
siliceous limestone of 11 feet between a one foot layer of light 
cherty limestone at the base and a blue cherty layer of two feet 
at the top. Weathers black to buff. No fossils seen. No calcite 
veins and no chert in the middle portion. 14 feet. 
4. Gray crystalline limestone layer with no apparent bedding. 
No chert. Joints intersect in all directions giving angular blocks 
of small size. Calcite nodules numerous and a little calcite along 
the joints. Weathers dark. No fossils seen. 10 feet. 
5. Light siliceous limestone with veins and small nodules of 
calcite, also of quartz, and the entire division is sprinkled with 
quartz grains. This division is conspicuous as a light band 
across the face of the cliff as it weathers very light. There are 
disconnected delicate pink threads shot throughout the layer. 
3 feet. 
6. Dove colored, fine grained, dense, siliceous limestone with 
inconspicuous bedding. No chert, but with numerous calcite 
veins, some of which are in the joint planes. Calcite nodules and 
crystals give this division a mottled appearance. No fossils seen. 
7 feet. 
7. Bluish, massive, cherty, crystalline limestone, with round 
quartz veins and fragments of chert and chalcedony. The bed- 
ding is not apparent. Weathers brownish with ferruginous 
blotches. Crystals of light and dark calcite give a pronounced 
mottled appearance to some layers. Coarse, hackly fracture and 
little jointing; no fossils. 31 feet. 
8. Bluish gray to drab, dense, fine grained, crystalline, un- 
even bedded limestone with calcite veins and bunches of calcite 
crystals. Fractures and weathers as No. 7. Joints are rare but 
when they do occur they are in all directions. This division 
seems to be a leveling up layer on a surface of marine erosion. 
4 to 8 feet. 
9. Medium to coarse crystalline limestone, light gray in color. 
Distinct layers of light chert are numerous towards the bottom. 
