GEOLOGY OF GILES COUNTY, VIRGINIA 
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Brachiopods were found about 50 feet above the breccia, hence 
low in this member, on the west side of New River. 
5. Dark blue to black, fine grained, dense, non-crystalline 
limestone with the bedding concealed, and not developed by 
weathering. There is considerable black chert in nodules and in 
layers of nodules. These nodules, as well as the limestone itself, 
are veined with calcite. The chert is brittle and ferruginous, and 
both the chert and the limestone weather a rusty brown. Calcite 
is light and conspicuous. Jointing is meager. Pyrite crystals 
occur. 20 feet. 
6. A very dark, blue black limestone with a hackly, rough 
fracture. Many valcite veins and some bundles of calcite crystals. 
The veins run in all directions, but the larger ones are at right 
angles to the bedding plane. Bedding is irregular. Pyrite 
crystals are common. 7 feet. 
7. Fine, even grained, light gray to bluish limestone with close 
bedding. Fracture is smooth, fluted, and curved. This division 
looks and sounds flinty. Only a few calcite crystals and veins. 
No chert. Two layers ; the upper being the lighter. Considerable 
pyrite, crystalline lenses in the middle portion. Weathers a light 
brown. 41/? feet. 
8. Massive, light gray layer of fine grained, flinty limestone, 
with many small calcite veins, as well as some pyrite in scattered 
crystals and veins. Conchoidal fracture. Beds thicken and 
thin out locally. Weathers a little rusty but lighter than the 
rock. Boundary between 8 and 9 rather indefinite. 5 feet. 
9. Massive, coarsely crystalline, dark blue limestone with 
cuboidal fracture. Bunches and veins of calcite occur, mostly in 
the joints. This division has the ap.pearance of granite at a short 
distance. No chert or fossils. At one time this bed was used 
extensively for lime. Weathers a rusty grey. 16 feet. 
10. Dark blue to black, thin bedded limestone, with many 
chert layers in black brittle nodules. Fine grained, calcite veined, 
fossiliferous matrix with the chert nodules, which weather out. 
Pyrite crystals, also brachiopods, cephalopods, crinoid stems, and 
corals. ' 15 feet. 
11. Partly covered interval. A dense crystalline, dark lime- 
stone. Some chert and many calcite veins. Weathers almost 
white. Fossils as in 10, with the addition of gastropods. 
83 feet. 
