40 
The Ohio Naturalist. 
[Vol. XIII, No. 2, 
The two most characteristic fossils of the lower part of the 
Cloche island beds are Columnaria halli and Stromatocerium 
rugosum. Columnaria halli ranges from the base of these beds to 
about 45 feet above the base. Stromatocerium rugosum was found 
about 20 feet above the base and may occur also at other levels in 
the lower part of these beds. It is evident that both Columnaria 
halli and Stromatocerium rugosum may be looked for in the under¬ 
lying Swift Current limestones, since Columnaria halli occurs in 
the upper or Leray member of the Tyrone formation in Central 
Kentucky, and has been found also in the Lowville at Watertown, 
New York; while Stromatocerium rugosum is found in the Lowville 
northeast of Watertown, New York. 
Receptaculites occidentalis begins its range about 20 feet above 
the base of the Cloche island beds; it becomes common at 55 feet 
above the base, where the first specimens of Maclurea logani are 
seen. No specimens of Gonioceras anceps were discovered within 
80 feet of the base of these limestones, but they begin their range 
a short distance above this level, and all three species, Receptacu¬ 
lites occidentalis, Maclurea logani, and Gonioceras anceps extend to 
the extreme top of the section as exposed on Cloche island, but 
have not been found in the lowest Trenton layers found on Goat 
island, immediately southward. The presence of these fossils is 
therefore used here to discriminate the Black river from the over- 
lying Trenton limestones. It should be remembered, however, 
that Receptaculites occidentalis has been identified by Ulrich from 
the Curdsville bed, in the lower Trenton of Kentucky, and species 
of Maclurina, which can not readily be distinguished from Maclu¬ 
rea in the field, occur in the Trenton of the northwestern states. 
Moreover, considering the very close similarity of the Curdsville 
fauna on Goat island to that found in the underlying Cloche 
island limestones, it would be rash to state that no Gonioceras 
ever will be found in the Curdsville. The chief point is that the 
great abundance of Receptaculites, Gonioceras, and Maclurea dis¬ 
tinguishes the top of the Cloche island Black river limestones 
readily from the base of the lowest Trenton limestones found on 
Goat island. 
Near the top of the Black river exposures on Cloche island, 
within a mile of the southwestern termination of that part of the 
railroad which crosses Cloche island, Protarea vetusta, Calapoecia 
canadensis, Petraia aperta, a large celled form of Columnaria 
alveolata, with more or less discrete and rounded corallites, 7 mm. 
in diameter, and a specimen doubtfully identified as Eurystomites 
undatus occur. Of these, Protarea vetusta has been recorded 
hitherto only from the lower Trenton, but the other four forms 
mentioned have so far not been recorded from the Trenton, and 
are regarded as characteristic Black river species or varieties. 
