70 
BULLETIN OF THE LABORATORIES 
Stone is hard enough, show evidence of this glacial action in the form 
of grooves, scratches and the planed surfaces of the stone. 
CaJTollton Pike Quarry. [Section IV.) 
Along the Carrollton pike about half a mile from the Home Grounds, 
on the east side of the road, a quarry was opened, which developed a 
layer of Niagara flagging stone 5 or 6 inches thick. It was smoothed 
above by glacial action, was found within two feet of the surface, and 
hence was readily worked, and sold to advantage as a fair quality of 
Dayton limestone. In several places in Dayton it was used without 
extra preparation for side walk purposes. Beneath is a layer of thin- 
ner stone and then limestone of the Clinton Group, of little or no com- 
mercial value, and therefore, not quarried. Here specimens of 
Orthis fausta were found. This species has also been found at Swartz- 
baugh’s quarry, in the same position, namely at the very summit of the 
Clinton Group. 
Eaton Pike Quarry. 
North-west of the Soldiers’ Home grounds. On the north side of the 
Eaton pike the Clinton rock is quarried. Neither the top nor the bot- 
tom of the series is exposed but the two levels taken register 211.92 ft. 
and 205.50, which give a thickness of 6 ft. 5 in., but the real height of 
the strata is no doubt much greater. Numerous bryozoans are found 
here. 
Tke Grotto. 
East of the Soldiers’ Home along the railroad, a cut through rock of 
the Cincinnati Group displays the characteristic fossils of this group. 
South of the terminus of the railroad in the grounds are the socalled 
grottoes. These were formerly the site of an old quarry, and belong 
to rocks of the Clinton Group. Owing to the underlying bed of blue 
clay the Clinton Group is usually a great water bearer. At Soldiers’ 
Home one of the grotto springs is fed in this way, and two springs of 
the same nature in the quarry south of the grotto give forth a steady flow 
of water all year. The grotto is now used for floral effects only. 
Soldiers’ Home Quarries. [Section II.) 
The Soldiers’ Home quarry is the finest exposure of the Clinton 
Group in the State. Being constantly in operation, it has proved ^he 
most productive place for fossil remains. Both the Niagara and Cin- 
