10 The American (jeologlst. juiy, i89ft 
Knife hike: Iho latter is the series of hoh:)erystalline mica and 
liornblende sehists tliat often occur botli north and soutl) of the 
former. 
The term ••Ogishke conglomerate" has l)een used in this paper, 
as before stated, as referring to the conglomeritic terrane of nearly 
vertical dip, which lies on the shores of and to the north of 
Ogishke Muncie lake. This conglomerate has always been con- 
sidered as a single formation, but in 1888 N. H. Winchell* stated 
some evidence for the existence of two conglomerates near this 
place and separated them into an upper and a lower member, which 
he provisionally referred to the Animike and Keewatin respective!}'. 
However, the younger of these is largely seen to the southeast of 
Ogishke Muncie lake and has not ]>een studied by other geologists. 
So in this paper the older of these two conglomerates is the one 
under consideration. 
Summary. The Animike and the Ogishke conglomerate can no 
longer l>e parallelized, as has often been done, for the former is 
separated from the latter by a great structural break and a long 
erosion interval. For the same reason the Animike can not be 
correlated with the Keewatin. The relation of the Ogishke con- 
glomerate to . the Keewatin has not yet been conclusively estab- 
lished, but all agree that it is younger than most of the Keewatin. 
and for the present it seems best to consider it as i)art of the 
Keewatin. 
Pctrograpliu-al LaJ>(>rat.ory of the Joliiis Hopkins University, 
liaJfimon-, April, 189-2. 
NOTES ON THE STRATIGRAPHY OF A PORTION 
OF CENTRAL APPALACHIAN VIRGINIA. 
By N. H. Dahton, U. S. Geological Survey, Washington, D. C. 
It is the purpose of these notes to describe the salient features 
of the stratigraphic column of the region, to assign definite names 
to certain of its mambsrs, and to call attention to a significant 
unconformity at or near the base of the Devonian. The field 
studies were made mainly in connection with the preparation of a 
detailed geologic map of Augusta, Highland, and portions of ad- 
*Geol and Nat. Hist. Survey of Minn., 17th (1887) Ann. Kept., pp. 97-98. 
