aypole.,] 496 {May 16, 
LiMir oF THE CLINTON Fauna. 
At this horizon the Clinton fauna, pure and alone, altogether ceases. 
Above the Sandvein ore bed (or limestone in some places) comes a mass 
of green shale and thin hard limestone bands about 150 feet thick, in which 
fossils are scarce, but from which I have obtained a few species. Among 
these the only ones yet recognized with certainty are : 
Lingula oblonga, Hall. 
Beyrichia notata, Mall. 
The former of these is a Clinton species in New York, and the latter 
was described from the Lower Helderberg rocks. We have here, there- 
fore, 4 mingling of the faunas of the two groups indicating passage beds 
from one to the other.* This commingling of species is limited, so far as I 
have yet observed, to the belt of green shales and limestones above men- 
tioned. Immediately over it lies the great (Bloomsburg) Red shale, whicl 
is almost barren, but which will be discussed below. Tere it will suffice 
to observe that no Clinton forms have been found in it. 
Paleontology, therefore, fully bears out the division above adopted for 
the lower part of this great mass of shales and sandstones, which have 
been hitherto thrown together into that Limbo of shale, No. 5 of Rogers. 
The arrangement deduced from the above train of reasoning is as given, 
below : 
Table of the Olinton grouv as proposed for Perry county. 
Onondaga group. Red shale. 
150 Passage beds. Green shale and limestone. 
( Sandvein ore bed. 
Ore sandrock and haematite. 
Upper green shale and fossil ore. 
Tron sandstone. 
Hard fossil block ore. 
Lower green shale. 
139 
989) Clinton, ProuUpii su eivws es 
3 | 
| 
These beds are thus correlated, with those in the Report of the First 
Survey of Prof. Rogers (Vol. I, p. 182), of which they are here considered 
equivalent. 
Onondaga, Red shale. Surgent red shale. 
{ Green shale and lime- 
UC BtOM GN ihe Waite vin'y 5 
( Ore sandrock and ore. Ore sandstone. 
Upper green shale 
SOG OMS NG wl , 
Tron sandstone a 
Passage beds. Surgent upper shale. 
Lower shale, Upper slate. 
d 
NC Tron sandstone, 
OLR HL ee es pale . 
OUDtORE ys. | 
(Lower green shale Lower slate. 
£ 
* Later examinations render probable the presence of several other Clinton 
forms in these green shales and limestones, which will give a more decidedly 
Clinton aspect to the fauna without invalidating the conclusions here reached. 
