Clinton and Niagara Strata. — Sarle. 297 
Dr. Ringueberg recently directed the writer's attention to a 
field in the western outskirts of Lockport in which a dozen or 
more small patches of rock project through the soil, in low, 
dome-like prominences [PL xxxi, Fig. 10] ; and expressed the 
opinion that they are of the same nature as the masses of the 
Clinton. A visit to the locality corroborated this opinion. At 
one side of a quarry in this lot, the uneven character and the 
thickening of the beds abutting a mass, may be seen. The crest 
of the reef itself appears a little farther back. Its form evident- 
ly is ridge-like. Its position may be traced for eighty-eight 
paces by an overlying crest of upturned rock edges passing 
into a ridge of soil, fading out with the increasing depth of the 
drift. Another reef has been blasted through in forming a 
roadway from this quarry. 
Five other examples, left completely isolated by the removal 
of rock, were found in a neighboring quarry. One of these has 
been partially destroyed, leaving only the basal portion ; two 
stand in relief upon basin-shaped pedestals of limestone 
[PI. X xi, Fig. Ti] ; one, ridge-like and extending in the same 
direction as the mass of similar shape described above, has 
been trf ced thirty-one paces to its disappearance under the em- 
bankment of the Falls Branch of the New York Central rail- 
road ; one fuses into the quarry floor, which slopes gently from 
it, a ridge-like rounding . of this limestone surface on one 
side, forming a continuation of the long axis of the reef. 
This surface shows the configuration of the old sea floor in the 
vicinity of the reef. The hard, compact structure of this 
floor is in marked contrast to the loose shaly nature of the 
weathered reef rock. Another quarry in the vicinity has afford- 
ed five more. The electric road from Tonawanda to Lockport 
cuts through this level, exposing two reefs. 
Some of the reefs observed must start almost upon the im- 
pure concretionary base of the Lockport limestone, others fif- 
teen to twenty feet higher. The largest is that at Niagara 
gorge, at the cantilever bridge. 
This horizon includes the encrinal band and perhaps the 
lower portion of the Coralline limestone described by Hall. 
They may extend still higher, for professor Hall* describes a 
mass and accompanying arching of the strata, as occurring 
*Geol. 4th District, N. Y., p. 92. 
