central basin of Tennessee. Little has been pnhlished concerning the fauna 

 of the Mosheim and apparently its age is determined by its occurrence upon 

 the upper Knox of Canadian age and below the Lenoir limestone of un- 

 doubted Stones River age. 



The Lenoir limestone was identified by Safford and Killebrew and re- 

 ferred to by them in the Elementary Geology of Tennessee (1900) as the 

 "Maclurea limestone" from the abundance of Maclurites rtiagnus which it 

 contains. A fossil list of twenty-two species consisting of brachiopods, gas- 

 tropods, trilobites, ostracods, corals, and sponges is published in Bulletin 92 

 of the United States National Museum. In comparing this list with the 

 faunas of the Central Basin it is found that two species, Maclurites magnus 

 and Zittela varians, which are characteristic of the middle Stones River, 

 occur in both areas. Zittela variens is found in the Ridley limestone and 

 Maclurites magnus in all divisions of the Stones River in the Central 

 Basin area, which indicates that the Lenoir limestone is probably equiv- 

 alent in age to more than the Pierce formation as expressed by Dr. Ulrich. 

 It is possible that the bryozoan fauna concerning which little is published 

 will further restrict the boundaries. 



Virginia. The Stones River group is present in the western part of 

 Virginia, where it is represented by a thickness of 9(10 feet of heavily bedded 

 dolomitic layers interbedded with pure, dove-colored limestones. The thick- 

 ness diminishes southward. The presence of the dove-colored beds and the 

 growth of cedars in the soil upon the formation are conspicuous characters 

 that distinguish the Stones River from other limestones of this region, feat- 

 ures which are identical witli the type area of the Stones River in central 

 Tennessee. 



Until the study of the fossils from the limestones in West Virginia was 

 made by Dr. Bassler,^ all the beds were included within the Chickamauga 

 limestone, but he has correlated the lower part of the series with the Stones 

 River of eastern Tennessee, on the basis of the occurrence of Leperditia 

 ffihitlitcs (Conrad), Lophofi})ira srrnihita (Salter), L. perangulata (Hall), 

 and a single Tetradiuin. i>robal)ly 'I'cf radium syringoporidcs Ulrich and 

 also because of litliologic similarity and stratigraphic position. The group 

 of fossils undoubtedly determines the age to be equivalent to that of the 

 Stones River liniest(me in the central basin of Tennessee. 



West Virginia. MargJand and I'cini.sglrtriiia. At Martinsburg, West Vir- 

 ginia, 675 feet of limestone is referred by Ilrich and Stoss to the Stones 

 River. They measured the following section :' 



.4. Light to dai'k drab limestone banded witli thin earthy or 



magnesian seams 27") feet 



3. Similar beds, less well exposed 200 feet 



2. Dark gray to dove-colored fine even-grained pure lime- 

 stone ( (luarried I 100 feet 



1. Similar line-grained, dovie-colored limestone increasing 



downward in magnesium (quarried) 100 feet 



.Total .675 feet 



iBullptin Geol. Soc. of Amer. Vol. 22. 



^Cement Resources of Virginia. Bull. II — A, 1909. 



