20 The American Geologist. July, i895 
survey to put the stamp of approval upon one or the other of 
these diverging views. 
Up to the time of the Wisconsin survey, therefore, it may 
be said that the following was the state of opinion of the 
leading otlicial authorities on the geological questions under 
consideration : 
1. The Huronian system is a vast congeries of Azoic frag- 
mentals, cut by granitic and trappean eruptives. 
2. The copper-bearing series overlies the Huronian, the 
upper volcanic group non-conformable on the original Huron- 
ian, and the lower volcanic group non-conformable on the 
expanded Huronian, 
3. The upper volcanic group is non-conformable on the 
lower volcanic group. 
4. The Cupriferous series (upper volcanic group), is close- 
ly associated with sandstones, the upper portions of which, 
and probably the lower, are of Potsdam age, the non-con- 
formities with the traps being incidents of an eruptive age 
and of local extent and significance, — or 
5. The horizontal sandstones are of wholly later date, of 
Potsdam age, and, being non-conforraable against tilted trap, 
cannot be of the age of the trap. 
[Pal.^ontological Notes from Buchtel College. No. ii.] 
ACTINOPHORUS CLARKI, NEWBERRY. 
By E. W. Claypole, Akron, Ohio. 
(Plate II.) 
In his monograph of the fossil fishes of North America Dr. 
Newberry described and figured a specimen under the above 
name of which, however, veiy few details were given in con- 
sequence of the imperfection and indistinctness of the fossil. 
It was obtained by Dr. Clark of Berea, Ohio, from the Cleve- 
land shale and is now in the collection of Columbia college. 
Since that time Dr. Clark has found another specimen of 
the same fish which being in better condition, though incom- 
plete, enables us to recognize some additional features. On 
this fossil the following note is based. 
Actinophorus chu-ki was, according to Dr. Newberry's de- 
