GEOLOGY OF GILES COUNTY, VIRGINIA 
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the South, but in this locality, while there are a few small occur- 
rences, it is a coarse grained, dull gray rock fit only for build- 
ing purposes. Like the Shenandoah, this limestone disintegrates 
into a rich soil, characteristic of such fertile spots as Burke’s 
Garden and the Pearisburg areas. Unlike the underlying forma- 
tion, however, the undesirable residual mantle of chert is not pro- 
nounced. This formation has its greatest development near the 
margin of the Appalachian Valley. 
Paleontology and Correlation 
The following is a list* of fossils found in the Chickamauga 
formation of Giles County: 
Tetradium fibratum 
Constellaria sp. 
Dalmanella fertilis. 
Heterorthis clytie. 
Dinorthis pectinella 
Hebertella clytie? 
Girvanella sp. 
Solenopora sp. 
Eospongia sp. 
Agnostus sp. 
Malcurea magna 
Hormotoma artimesia 
This list seems to indicate that the Chickamauga is early 
Ordovician in age, as there are forms here which are charac- 
teristic of the Beekmantown, Chazy and early Trenton of New 
York. Almost the same fauna has been described by Ruedemann^ 
from a conglomerate inclosed in the Normanskill shales at Ryse- 
dorph Hill, Rensselaer County, New York. The conglomerate is 
made up of pebbles of Beekmantown, Chazy, and early Trenton 
age. Beekmantown fossils, however, are also found in the upper 
Shenandoah, but here are also found Cryptozoons characteristic 
of the Ozarkian system. 
Portions of the above listed fauna are also found in the Stones 
River, Chambersburg, Murat, Athens, and Holston formations. 
In the Chickamauga, there is also found resemblance, faunally, 
* For the most part, after Bassler and others. 
® Ruedemann, R., ‘Trenton Conglomerate of Rysedorph Hill and its 
Fauna.” Bull. 49, New York State Museum, 1908, pp. 1-115. 
Ophileta complanata 
Stylarea parva 
Echinosphaerites surantium 
Isotelus gigas 
Illaenus americana? 
Rafinesquina sp. 
Strophomena sp. 
Leptaena rhomboidalis 
Orthoceras sp. 
Batostoma sp. 
Plectambonites pisum 
