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oe 423 
commencing on page 167.* By reference to this paper, it will be seen, 
however, that the principal objects its authors had in view, were to show : 
Ist, That the Rockford Goniatite bed, which Prof. Hall had ina paper 
published in the Thirteenth Annual report of the Regents of the Univer- 
sity of New York, referred to the horizon of the Marcellus Shale of the 
New York Series, is much more recent than that rock, and in fact an 
equivalent of the beds at Burlington, Iowa, which he had placed on a 
| the Hamilton Group beds in Illinois—and 
from this fact, as well as from the affinities of the very few fossils hitherto 
esents the Genesee Slate of the New York 
Series, as suggested by Prof. Yandell and Dr. Shumard, as well as by Mr. 
DeVerneuil 
recent period ; though they did not say they rega' 
that these beds belong to the Carboniferous System. 
above alluded to 
per in the Report of the Regents, ea per 
“i ? 
Chemung. He also states that 
is room to doubt” in regard to t c 
Group and the Black Slate of the west, and whether this 
* Remarks on th of the Goniatite Limestone at Rockford, Indiana, and its 
relations to the “ Black Slate” of the Western States, and to some of the sueceeding 
er;  B. Meex and A. H. WortHen. ata | 
_ + They likewise admitted that there may be some representation of maton ad 
w the horizon of the Limestone of Prof. Swallow, nd its 
ngton, rd, Indiana, but denied that this 
