' GEOLOGY OF GILES COUNTY, VIRGINIA 309 
Virginia are also discussed briefly in this bulletin, which has been 
used rather freely by the writers. 
The above list completes the published references to the 
geology of Giles County. In addition, however, Watson has pub- 
lished a geological map of the state of Virginia. The geology of 
Giles County, on this map, is simply represented by five large 
divisions, whose boundaries are not extremely accurate. 
METHOD OF WORK AND ACKNOWLEDGMENTS 
Field parties of students gathered from various colleges and 
universities have for some time worked in this region as a part 
of the Oberlin College Summer Session. The work was started in 
1908 in Bland County and since that date nine other parties have 
studied in the region, and eight of these in Giles County itself. 
The camp from which the work was done has been each year in 
a new place so that a considerable part of the county has now 
been worked. Over 75 students have contributed to the 
solution of the geologic problems of the area. During each of 
these years a portion of the geologic section has been measured 
and described in detail, and this description has been handed on 
to the next class, so that a considerable heritage has accumulated. 
In like manner collections of rocks and fossils have been made 
and added to the collections of former classes. Lists of char- 
acteristic fossils have thus been built up for several formations 
and for a larger number of members. No publications have ever 
come from this work but there is now a large body of data avail- 
able for detailed study. It is hoped to put this material into 
shape for publication as special papers or topical studies, but 
first there seemed to be need for a general paper covering some 
such unit area as a county. Hence this paper has been prepared. 
The sections recorded in the body of this paper are the accumu- 
lations of the several summers of work. Only a small percent 
was actually measured and described in any one year. Credit is 
due each class for its contribution to the whole. Credit should 
also be given Messrs. E. R. Smith of De Pauw University and 
C. W. Honess of Oklahoma University for special work on the 
fossils. They have spent a second summer collecting and have 
given much time to the study and identification of the various 
forms collected. 
