J. L. Campbelli— Geology of the Blue Ridge. 221 
ART. XXX.— Geology of the Blue Ridge near Balcony Falls, 
Virginia ; a modified view ; by JoHN L. CAMPBELL. 
ut, as regards the stratified beds flanking the main ridge 
on its eastern slope, subsequent observations have modified the 
views expressed on page 439 of the paper referred to above, 
where the following paragraph occurs :— 
‘The bedded rocks (1, a 6,) that rest upon the syenite are 
very much metamorphosed, are gneissoid in character, and dip 
toward the southeast. [Correct so far]. Then follows a bed of 
forty or fifty feet of conglomerate and quartzite, bearing some 
resemblance to the conglomerate sandstones on the opposite 
side of the ridge, but so different in composition, texture, posi- 
tion and thickness as to preclude the idea that they have any 
historical connection. Over this again we find another bed of 
slate. These beds all dip toward the southeast while their up- 
per margins reach beyond the underlying syenite and granulite, 
and with their edges support the lowest beds of Primordial 
rocks, where both extend high up on the ridges, beyond the 
limits of the igneous beds.” 
t was a mistake, as will appear farther on, to class these as 
Archean beds. But some apology may be found for my mis- 
take in the fact that Prot. W. B. Rogers, in his notes on the 
geology of Virginia, as found in Macfarlane’s Geological Rail- 
way Guide, speaks of the rocks between Lynchburg and Bal- 
cony Falls as all belonging to the Laurentian and Huronian 
(his A and B) formations. I had not, however, seen that 
note of his before the paper above quoted was published ; so 
that I am entirely responsible for my own partially erroneous. 
conclusion. 
_ After my paper on this subject had been published, suspi- 
clons arose in my mind that the conglomerate and slate beds 
along the eastern flank of the main Blue Ridge might be of 
Cambrian age, and so modified by the metamorphic agencies as 
to have their characteristic features obscure; but engagements 
elsewhere diverted my attention from them until recently. 
