GEOLOGY OF GILES COUNTY, VIRGINIA 335 
limestone. The color is grey blue. There are many white calcite 
veins and some pyrite crystals. No fossils or chert. Weathers 
light. 15 feet. 
21. Thin bedded gray limestone, with thin shales, rarely 
veined with the exception of the bottom layer. Much mottled 
with small amorphous masses in a coarser crystalline matrix. 
Seems to be slightly conglomeratic. There are many fossil 
fragments ; bryozoans, trilobites, crinoid fragrnents, brachiopods, 
corals, etc. 7 feet. 
22. Coarse crystalline, light gray limestone, strongly veined 
with white calcite and some pyrite. There is no chert, but there 
are many fragments of fossils and some very whole and distinct, 
girvanella, brachiopods, bryozoans, trilobites and pelecypods. 
There is one mottled conglomeratic layer as in 21. The joints 
are irregular and are, for the most part, filled with calcite. The 
weathering emphasizes the amorphous inclusions. 41/2 feet. 
23. Dark blue to gray, fine grained, non-crystalline limestone, 
shot with numerous calcite veins. Bedding emphasized by 
weathering. Dip joints. Has clay conglomerate or breccia. 
Ends with layers about three feet above the first rocks which 
have the Moccasin appearance. 22 feet. 
The samples collected from the various horizons of the Chicka- 
mauga limestone in this section show a remarkable uniformity in 
composition. The high lime content of these strata is indicative 
of their present exploitation in other parts of the state and of 
their future development here. 
Analysis of Chickamauga Limestone, 
Narrows section, Virginia^® 
(J. H. Gibboney, Analyst) 
1 
2 
3 
Insoluble 
5.60 
1.50 
2.30 
Alumina 
Iron oxide 
j- 0.78 
0.56 
0.60 
Lime 
51.40 
54.76 
54.06 
Calcium carbonate 
91.80 
97.78 
96.54 
Magnesia 
...... 0.72 
0.15 
0.30 
Magnesium carbonate .... 
1.52 
0.31 
0.64 
10 
Bassler, R. S., ‘‘Cement Resources of Virginia.” pp. 189, 
