298 J. B. Elliott—Age of the Southern Appalachians. 
states contains actinolite (corresponding with the tremolite- 
bearing marble of Murphy, Knox dolomite), and the latter as 
being filled with interlacing calcite veins (corresponding with 
of the Smoky Mountains as are the representatives of the 
Knox Group between Jasper and Talking Rock. Moreover, 
the Air Line railroad from Atlanta to Spartanburg, S. ©. 
runs parallel with the strike of the strata east of the Blue 
Ridge and the same beds noticed near Acworth, i. e., sandy 
light colored gneiss, with mica schists and hornblende slates, 
show in every cut of the road. In these latter beds also occur 
manner of geological reconnaissances rather than of detailed 
surveys, en, however, it is remembered that in the four 
sections given the different formations:have been crossed an 
recrossed six times; that these formations are marked by 
peculiarities of structure that are strikingly characteristic, and 
that they present a topography singularly uniform over 1m 
mense areas, the conclusions will perhaps be deemed less 1neX- 
cusable. 
The writer takes pleasure in acknowledging his indebtedness 
to Professor Safford, whose report upon the Geology of ten 
nessee has been his guide in the study of these Lower Silurian 
formations ; to Professor Bradley, whose section through these 
metamorphic areas he has carefully studied ; and to Mr. Arthur 
M. Huger, of Charleston, S. C., to whom he is indebted for 
valuable information and suggestions, and for many collections 
of typical specimens from the formations traversed. 
