Preliminary Notes on Cincinnatian and Lexington Fossils 295 
The underlying part, characterized by the presence of a con- 
siderable fauna, including Orthorhynchula linneyi, Hebertella 
maria-parksensis, Eridotrypa hriareus, Constellaria emaciata, 
Homotrypella norwoodi, is called the Greendale bed, this designa- 
tion having been given at an earlier date to the southern extension 
of this bed in Fayette county, Kentucky. 
The northern extension of this fauna along the Ohio river, east 
of Cincinnati, especially the localities at Point Pleasant, Ivor, 
Carnestown and Foster, have been known a considerable time, 
and a very characteristic fauna has been collected at Ivor, Ky. 
At the latter locality, Orthorhynchula linneyi occurs, occasionally, 
at the level of the railroad. At Carnestown, a single specimen of 
Orthorhynchula linneyi was found 10 feet above the level of the 
railroad, at the top of a contorted layer of fine-grained limestone. 
This probably is at about the same horizon as the contorted layer 
of limestone which formerly was exposed just above railroad level 
at the quarry a quarter of a mile east of Ivor. 
The interval from this Orthorhynchula linneyi horizon, at Ivor 
and Carnestown, Kentucky, down to the Callopora multitabulata 
horizon is approximately 50 feet. It is this interval which forms 
the lowest fifty feet in the Ordovician section at Point Pleasant. 
It is this interval which includes the Point Pleasant beds of Pro- 
fessor Orton. At the time Professor Orton was writing his 
report, on the Geology of the Cincinnati Group, in volume I of the 
Ohio Geological Survey, rock was quarried at river level in the 
western edge of Point Pleasant and sent by river barges to Cin- 
cinnati. These were the lowest rocks exposed in the state and 
must have formed the base of his 50 foot section. The quarrying 
operations were continued until most of the rock which could be 
easily removed had been quarried out and the overload was too 
great to make further work at these lower levels profitable. Even 
before the lower quarries at river level were abandoned those above 
the level of the pike were opened up, but on that account it rnust 
not be assumed that Professor Orton’s measurement of 50 feet 
began with the road level in place of the river level. 
Moreover, the base of the shaly section at Point Pleasant, Ohio, 
is located about 113 feet above the Ohio river. This shaly sec- 
tion undoubtedly formed the base of the Eden shales in Professor 
Orton’s section. If from the underlying part the upper 50 feet 
were subtracted, as probably equivalent to the River quarry beds 
