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352 Geological Survey of the State of Ohio. 
In the sandstone of the Connecticut valley, ichthyolites (Palao- 
thrissa macrocephala) occur abundantly. Besides, according 
to Professor Hitchcock, the bones of a vertebrated animal, sev- 
eral feet in length, and not at all fossilized, have been found. In 
addition to this, ornithichnites* are found, the occurrence of 
which, while it draws line of demarkation between that forma- 
tion, and the old red sandstone, must separate it from any forma- 
tion in Ohio. For these reasons, we think that the new red sand- 
stone of the Connecticut valley, cannot have an equivalent in 
Ohio—that the two formations were produced at distinct geologi- 
cal epochs, and under circumstances widely different.t 
One of the principal topics embraced in Dr. Hildreth’s report, is 
the range and extent, as well as the economical value of the bur, 
or, as he terms it, the caleareo-silicious deposit. “It is,” he justly 
remarks, ‘one of the most interesting features in the geology of 
the coal measures of Ohio, and like the meridian line in geogra- 
phy, will afford a valuable guide in developing the rock strata 
which lie beneath, or are superimposed on this deposit.” This is 
a protean rock, at one time assuraing a cellular aspect, with little 
or no admixture of calcareous matter, and again — into a 
compact cherty limestone. Yet we are assured, (p. 29,) that 
under every aspect it may be known by the imbedded fossils ‘which 
accom: this rock in its whole course. The fossils, he after- 
wards informs us, peculiar to this deposit, are Encrini, Producti, 
Spiriferi, Terebratule, &c. Here we remark, that particular fos- 
sils are characteristic of particular formations; but we have not 
sufficient evidence to believe that the sapisnies members of @ 
group have their peculiar fossils. We have noticed all the fossils 
enumerated, in the mountain or carboniferous limestone, which 
underlies the coal measures of Ohio, in many of the iron ores iD- 
terstratified with them, in the blue limestone below the buhr, in 
the limestone in contact with it, and some of the fossiliferous 
as clearly settled as that of = orthoceratite or productus. An me of the 
Professor’s specimens we think, must convince the most incredulous. ; 
it as one of the most interesting discoveries which has recently been? 
in geology, we deprecate every pam? captiously, and without the ex 
of ie evidence, to detract from well earned re aE on foe the author. : 
t Phe writer has not rt inf to wi pl Id refer this sand 
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