308 
HUBBARD AND CRONEIS 
it were very good, considering the short time spent in the area. 
To quote the author, “Tlie examination of the area under con- 
sideration was purely a reconnaissance, and the notes in several 
localities must be regarded as tittle more than suggestions to 
the one who may make the detailed study on behalf of the U. S. 
G. S.” Stevenson, who was at the time Professor of Geology at 
the College of the City of New York, was a keen observer, and 
his work is not without value even today. A geological map 
accompanying the report, while recognizing but few divisions, 
is fairly accurate over wide areas. 
In addition to the above mentioned work, the U. S. G. S. in 
1884-7 made a reconnaissance map of the Dublin, Virginia-West 
Virginia quadrangle, in which is contained the greater part of 
Giles County. On this map, elevations are found to be very 
good, but no depression contour appears on the Dublin sheet, 
although there are many sinks in the county whose depth is close 
to 150 feet. However, everything considered, this topographic 
map is extraordinarily good for reconnaissance work. It was 
used, with corrections and modernization, as the base for the 
geologic map accompanying this report. 
In 1907, Watson^ published his “Mineral Resources of Vir- 
ginia,” which mentions the iron mines of the county, as well as 
the possibilities for the manufacture of cement. 
Two years later, in 1909, there appeared Bassler’s^ “Cement 
Resources of Virginia.” In this volume the stratigraphy of 
southwest Virginia is worked out in some detail. Giles County 
receives its share of attention, but post-Ordovician formations 
here, as elsewhere in the work, are slighted since they are not 
potential cement horizons. However, the writers have found this 
bulletin to be the very best of any of the meager sources of 
information on the Geology of Giles County. 
Stose and Miser,^ in their bulletin on the “Manganese Deposits 
of Western Virginia,” which was published in 1922, give a com- 
plete account of the prospects in the county under discussion. 
Physiographic forms, stratigraphy, and geography of western 
^ Watson, T. L., “Mineral Resources of Virginia,” Jamestown Exposi- 
tion Commission, 1907. 
^ Bassler, R. S., “Cement Resources of Virginia,” Bulletin 2A of the 
Virginia Geol. Survey, 1909. 
® Stose, G. W. and Miser, H. D., “Manganese Deposits of Western Vir- 
ginia,” Bulletin 23 of the Virginia Geol. Survey, 1922. 
