246 The American Geologist. -^p"^*'- ^^^^ 
more than ten feet, and appear to run under the dolomitic con- 
glomerate [agglomerate] on the west side. They present, in 
section, the appearance of two small arches of about four feet 
in hight, separated from one another by a few feet of the [ag- 
glomerate] , and sinking under the same rock on the north and 
south. ^^ ^^ * The dolomite [of the agglomerate] and the 
hmestone seem to pass into one another for a few inches, and 
show no tendency to separate at the junction. * * * 
"As none of this limestone comes from beneath the [ag- 
glomerate], where this reposes upon the Utica fromation, it is 
supposed to belong to a small disturbed lenticular portion, lying 
in or under the [agglomerate]. Smaller patches of the same 
limestone, a few feet in diameter, are seen in the forty yards 
north of the two chief masses ; and the whole may be connected 
beneath. There are other masses of similar limestone, only a 
few inches in diameter, which are completely enveloped in the 
conglomerate." 
The writer made two visits to this locality in August, 1900. 
He found the Helderbergian limestone considerably broken and 
disturbed, with all the crevices filled up by the dolomitic paste 
of the agglomerate which covers the island. The amount 
of this limestone exposed is too great to warrant any assump- 
tion other than that it represents an outlier in situ above the 
Utica, having been subjected to seismic action shortly before 
the deposition of the agglomerate. The stratification of the 
limestone, as seen by the lines of fossils, is too irregular to 
make out the general lay of the mass. 
In the grassy slope but a few feet away from the Helder- 
bergian, there is a large block of a slightly granular siliceous 
limestone involved in, and forming a part of, the agglomerate. 
A number of fossils have been collected from this block and 
mixed up with some from the Helderbergian. Thesfe speci- 
mens, however* by their color and preservation, can be readily 
distinguished from those of the Helderbergian limestone, and 
have nothing in common with Ihe latter. They will be men- 
tioned again later on. 
THE HELDERBERGIAN FAUNA. 
In the Geology of Canada cited, Logan lists 9 species de- 
termined by Billings. It is not necessary to reproduce this list, 
