No. 200. J 
357 
points, as at Medina, are covered with fossil stems of vegetables, chiefly 
of the family of fucoides. The most common species is the fucoides 
Harlani, (Conrad,) in the form of stems which branch and cross each 
other, and which possess transverse striae, and other evidences of an or- 
ganic nature. Another very pretty fucoides occurs at the same locality, 
apparently consisting of short thick leaves, resembling a cactus, and 
with no apparent stems. The above are accompanied by other species 
of an irregular form. The new genus instituted by Mr. Conrad, Dic- 
^wo/te-Beckii occurs in the uppermost layers, and has not yet been 
seen at any depth in the sandstone. It occurs in the upper layers one 
mile south of Holley. About 40 feet deep in the sandstone occur one 
or two layers of about two feet in thickness, containing a new species 
of Lingula, the L. cuneata, associated with fresh water shells, viz: Unio 
primigenius, Cyclostoma pervetusta and Planorbis trilobatus, as describ- 
ed by Mr. Conrad. Associated with the above shells, is a species of 
Cytherina, very much resembling that which occurs in the bituminous 
limestone of Wayne county. 
At Medina can be seen, in great perfection, those appearances which 
have been called ripple marks. They consist of parallel furrow^s, or 
depressions on the surface of the layers, resembling exactly the tide or 
ripple marks in the fine sand on the shores of rivers. They are slightly 
waved, or serpentine, and sometimes run into each other. Near the 
culvert at Medina, these furrows appear on both sides of the canal, 
without any interruption, for about 100 yards. They exist on the up- 
per surface of the upper layer of the sandstone, w^hich is here gray and 
very siliceous, and contains the Dictuolites, or net-like fucoides, which 
sometimes continue across the furrows, as if they had been inflexible. 
These furrow^s are on several of the top layers, and occasionally we ob- 
served the marks, not on the upper surface, but having a small portion 
of rock above them. The above remarks refer to the rock on the south 
side of the canal. Direction of the fuirows east 20° north. At one 
limited spot the direction was N. W. 
The furrows, or marks, on the north side of the canal, immediately 
opposite to the preceding, have a general direction of west 20° north, 
and in one or two limited spots they were east and \vest. 
The floor of a mill, or factory, immediate at the falls of Oak Orchard 
creek, Medina, consists of a thick gray layer of sandstone, about 40 
feet deep in the rock. This layer presents an extensive surface covered 
with large and remsrkably distinct furrows. Direction east 20° north. 
