308 EDWARD M. KINDLE 
with Main Street in northeast Buffalo. Here the abruptly undulat- 
ing line of separation between the Onondaga limestone and the 
subjacent Cobleskill is frequently marked by a band of clay or shale 
a few inches in thickness. In the quarry of the Buffalo Cement 
Fic. 3.—Oriskany sandstone and adjacent beds of the Onondaga limestone 
and limestone of the Helderberg group southwest of Jamesville, N.Y., 3 mile. Lower 
end of hammer handle marks the top of the Oriskany. The Helderberg forms the 
foot of the fall. 
Company small caverns appear to have been developed in the 
Cobleskill during the land interval at the end of Silurian time. 
These contain sand fillings which have been described by Dr. J. M. 
Clarke.t At the cement quarries near Akron a thin band of blue 
™ Memoirs New York State Mus., No. 3, III (1900), 08. 
