CLINTON CONGLOMERATES AND WAVE MARKS. 173 
Garrard county, above the Crab Orchard shales, occur one or two 
layers of limestone, which contain small rounded grains of clear 
quartz. Both of these occurrences are in southern tounties, and 
they are probably good indications of strong wave action, with 
shallow waters, at the close of the Clinton age in this direction. 
Observations of Dr. John Locke.—The locality in the Clinton 
investigated is along Lick Run, three to four miles northeast of 
West Union. This is 12 miles a little east of south of Elkhorn 
creek, and 50 miles east of south from the Todd’s Fork locality. 
Waved layers were found. These are mentioned on page 244 
and on plate 6 of the first report of the Geological Survey of 
Ohio, 1838. According to the section two waved layers, 20 inches 
apart, were found. It seems difficult however to believe the 
occurrence of the flinty layer at the top of the Clinton. The 
region near West Union would probably offer information perti- 
nent to the present subject. 
OBSERVATIONS BY THE WRITER IN OHIO. 
LTodd’s Fork.—About two and a half miles north of Wilming- 
ton, the pike to Xenia crosses Todd’s Fork. In the immediate 
neighborhood, along the stream, are numerous exposures of the 
Dayton limestone and of the top of the Clinton. Their junction 
can be best studied by following the stream eastward a short 
distance. Towards the top of the Clinton is found the peculiar 
brown purple rock also seen at Wm. Alexander’s near Sharps- 
ville. It contains in places the peculiar branching masses of 
fragmental material resembling the so-called fucoidal markings, 
also seen at Alexander’s. In other courses of this purple rock, 
just beneath the Dayton limestone, was found a new brachiopod, 
a Craniella. The ferruginous red rock, so abundantly exposed 
a mile down the stream, was not seen here. Under the purplish 
layers the rock is brownish in color and contains numerous 
fossils. Going down the stream from the Xenia pike bridge, 
exposures of the Clinton are abundant. Wave marks were not 
seen at all. At several points cross-bedding is very marked, 
especially opposite a house belonging to Isaac Cline, of Wilming- 
