Strati (J rajjhy of ApjKdachlan Virginia. — Darton. 11 
jacent counties covered by the "Staunton Sheet" of the U. S. 
Geological Survey. This map will soon be published, together 
with sections and explanatory text, so that information regard- 
ing the distribution of the formations and their structure need 
not be given here. 
The principal geologic publications relating to the region are 
the reports* and notesf of the State Survey by W. B. Rogers, 
and a paper by J. L. Campbell, "Silurian formations in Vir- 
ginia. "J Although Rogers' observations were made over half a 
century ago, his reports, and especially the notes, give a remark- 
ably accurate and comprehensive account of the stratigraphy of 
Appalachian Virginia, but they are so brief that local features 
are not described. In the classification of the Paleozoics Rogers 
subdivided them into sixteen groups, to each of which a Roman 
numeral was assigned as a name. For the Carboniferous forma- 
tions descriptive or geographic names were also proposed. These 
numerals have been used to some extent by subsequent writers, 
but names from the New York series have gradually been intro- 
duced, and in the section on the Virginias in Macfarlane's Geo- 
logical Railway Guide, Rogers employs New York names to- 
gether with his numerals, for the formations below the Lower 
Carboniferous. 
Campbell's paper describes a section from Lexington to Warm 
Springs valley, and includes a table of the Silurian rocks "with 
their subdivisions compared with equivalent epochs of Dana's 
Manual. " 
Although the greater number of groups of the ]>ower Paleozoic 
of New York extend through Pennsylvania, and are more or less 
distinctly represented in Virginia, many of their component 
formations lose their distinctive characters, and their stratigraphic 
range is not apparent in the Virginia sections. Owing to this 
lack of evidence as to the i)recise stratigraphic equivalency and 
range of the Virginia formations in terms of the New York series, 
the use of New York terms is misleading. In the application of 
the New York nomenclature for Virginia formations nanii's were 
^Reports of Progress of the Geological Survey of the State of Vir- 
ginia, (1836-1841). 
tThe Virginias, Vol. 3, p. 194; Vol. 4, pp. 12, 13, 23, 38, 39, 59, 60, 71, 
72, (1882-1883). 
JAin. Jour. Sci., 3(1 series, Vol. 18, pp. 16-29, 119-128. 
