351 
[Foerste. 
reaching the anticlinal. This obstacle was not land, since the well- 
borings of Ohio show that the Clinton is continuous between these 
two regions. Perhaps it was deep water which made the chances 
for migration over the short distance from the anticlinal to the 
Alleghany axis less satisfactory than the opportunities for migra- 
tion for hundreds of miles along the western border of the old 
paleozoic continent. 
That the anticlinal during the Clinton period was near land at 
least, seems probable from the occurrence of conglomerate in the 
southern exposures of the Clinton in Ohio. But what formations 
were then exposed and where, seems not so certain. The pebbles 
from the Clinton of Ohio near Belfast in Highland county do not 
present recognizable remains in any of the specimens seen by us, 
nor is their lithological character such as to present positive evi- 
dence of any except their sedimentary origin. The cement bind- 
ing the pebbles together contains very fresh specimens of Cyclonema 
bilix and well preserved specimens of the so-called corals men- 
tioned by the Ohio Geological Survey, but which are chiefly species 
of branched forms of Ptilodictyce : Ptilodictya famelicus, Ptilodictya 
rudis , Stictopora similis , Phcenopora fimbriata and Phcenopora 
magma. Cyathophyllum celator var. IJaytonensis was also found. 
Single specimens of Orthis biforata , with two plications in the me- 
sial sinus, Orthis elegantula and a Rhynchonella resembling Rhyn - 
chomella acinus var. convexa were seen. All of the forms mentioned 
are common anticlinal Clinton forms. 
The finding of the fossil tree, Glyptodendron , in the marine Clin- 
ton of Ohio, if authentic, would be only suggestive of the proximity 
of land, and the fact of its isolated occurrence would make a con- 
siderable distance from this land more than probable. Yet even if 
the existence of shallow water at the anticlinal be conceded, the ex- 
istence of deep waters off the shore, between the anticlinal and the 
paleozoic continent on the east, can scarcely be proved at present. 
Yet for the present we suggest this view as a theory, perhaps to be 
compelled to withdraw it even ourselves should the proof to the 
contrary arise. That the anticlinal was of much consequence as a 
land exposure during the Clinton of Ohio seems rather doubtful, 
since a careful tracing of the Clinton from exposure to exposure, 
and its replacement where subsequent erosion is evident , leave un- 
accounted only places, in most of which subsequent erosion can 
scarcely be denied , even if not proven. This subject will receive 
more detailed consideration in a future paper. 
