476 A. W. Vogdes— Geology of Catoosa Co., Ga. 
Epoch. The upper beds are thin and composed of an are- 
naceous limestone, containing fragments of Crinoids and shells 
more or less wave-broken, as if this stratum marked the 
line of the Clinton sea. Immediately beneath the limestone 
we find a laminated sandy bed intermixed with sandstone of 
different degrees of hardness, which is well exposed in the 
railroad cut and along the banks of the Chickamauga River. 
The total thickness of these beds is about 150 feet, the strata 
having a general dip 15° east. 
The geological formation of Taylor's Ridge is more clearly 
defined with regard to the Upper Silurian age about ten miles 
southeast from Catoosa station, at Dug Gap in Whitfield county. 
This section exhibits the Lower Silurian black shales out- 
cropping along the base of the gap, dipping about twenty-five 
degrees to the east, and known in Dalton as the “coal beds; 
immediately above these shales the Medina sandstones appear 
or a sandstone which stratigraphically may be assigned to this 
group; as far as examined it contains no fossils. Superim- 
posed upon these sandstones along the second bench of the 
Gap we find the Clinton, which is composed in descending 
order of the following strata : 
1. Arenaceous layers and sandstone. ; 
2. Hematitic layers containing Calymene Clintoni, OC. rostrata, 
ilobitic. 
4. Sandstone containing Streptorhynchus subplana. 
5. Hard sandstone containing hematite. 
6. Light sandy beds of the Medina. 
