272 
central basin of Tennessee. Little has been published 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 magnus 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 900 feet of heavily bedded 
dolomitie 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 with 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 
fabulites (Conrad), Lophospira serrulata (Salter), L. perangulata (Hall), 
and a single Vetradium, probably Tetradium syringoporides Ulrich and 
also because of lithologic similarity and stratigraphic position. The group 
of fossils undoubtedly determines the age to be equivalent to that of the 
Stones River limestone in the central basin of Tennessee. 
West Virginia, Maryland and Pennsylvania, At Martinsburg, West Vir- 
ginia, 675 feet of limestone is referred by Ulrich and Stoss to the Stones 
River. They measured the following section :’ 
4. Light to dark drab limestone banded with thin earthy or 
MMA ONES SCAMS: ca, srozs casha mraie ate, d.'9)'thaes wrenele cee lor ohdriicrraeay 275 feet 
S. “UNimilarepeds: less well (@xpusednc. o8 ees ease chiar 200 feet 
2. Dark gray to dove-colored fine even-grained pure lime- 
SfONEe ((QUALEICO)t: : 2:57 CSiclois svete oele wrew othe pare oie ocean ee 100 feet 
1. Similar fine-grained, dove-colored limestone increasing 
downward in magnesium (quarried) ........:......... 100 feet 
ROGAN 1 cS elec esega ere a She Sie are SOFA aes wheel erate TE ee 675 feet 
1Bulletin Geol. Soc. of Amer. Vol. 22. 
iCement Resources of Virginia. Bull. II—A, 1909. 
