REVIEWS 389 
The author gives a description of individual mines and prospects. 
A good geologic map of the district is appended to the report. 
155 Jaks Wo 
The Stratigraphy and Correlation of the Devonian of Western Ten- 
nessee. By Cart O. Dunsar. State of Tennessee, State 
Geological Survey, Bull. No. 21, Nashville, Tenn., 1919. 
This volume is a detailed statement of the stratigraphy and correla- 
tion of the Devonian rocks of the western valley of the Tennessee River. 
The long sequence of the Devonian strata exposed in this region, 
especially the presence of the Upper Oriskany, and the abundance of 
fossils, probably will make this the standard section of the Lower 
Devonian of the entire Mississippi Basin. The important paleontological 
aspects of the problem are well treated. Following is the sequence of 
the Devonian formations of western Tennessee, as given by the author: 
Series Group Formation 
Neo-| Chautauquan Chattanooga shale 
devonian Hardin sandstone member 
Senecan 
Break 
Erian - 
Meso- 
devonian Pegram limestone 
—————— Break 
Camden chert 
—— Break 
Harriman chert 
Oriskanian ———— Break 
Quall limestone 
Ulsterian 
Break 
Decaturville chert 
———————— Break 
Birdsong shale 
——_—_———— Break ————_—_—_—_ 
Flat gap limestone 
Bear Branch limestone 
| Pyburn 
| Ross limestone 
—————— Break 
Rockhouse shale 
Paleo- 
devonian 
Helderbergian or Linden 
10n 
Olive Hill 
format 
