204 Marcou’s Geological Map. 
how he could have made the mistake. To make the matter 
worse, he cites the following I-calities in the United States: “It 
is very frequent at the Ohio fall, and at Charlestown Road, Indi- 
ana; in Ohio, New York, Pennsylvania and Tennessee.” Now 
the species figured is not Spirifer heteroclitus, it has not been 
found at either of the localities named except New York; the 
species found at the Ohio Fall and Charlestown Road is neither 
the species figured, nor is it the Spirifer heteroclitus ; though not 
only it, but one other species of that vicinity, resembles the Sp. 
heteroclitus still more strongly than the one figured: and finally, 
Wwe venture to say, that neither the species figured, nor either of 
those at the Ohio Fall or Charlestown Road, have been found in 
the other localities cited. , 
As an offset to the above, Chonetes nana, which is abundant 
and almost universal in rocks of this age, is cited as found only 
in the environs of Louisville. 
Our author commences his description of our carboniferous 
rocks by insisting upon the existence of “vast beds o 
and rock salt.” ormer is true of a few localities; as to the 
latter, one well authenticated locality only, so far as appears, fur- 
nishes rock salt. ; 
It is very remarkable that our author should have repeated the 
same rocks and groups under carboniferous, which have been de- 
scribed under Devonian, viz.: “The bituminous shale, (or black 
slate) and Waverly sandstone series, and the fine-grained 
stones of Ohio, Illinois, Indiana, the black slate of Tennessee, 
C. ese names, it is true, are not used, since he has omutte 
reference to all the western states in his Synonyma of Devonian 
sedimentary rocks; but as will be seen, he cannot extricate him- 
self from this difficulty. On page 30, he thus describes the Devo- 
nian: “To the west it extends through the southern part of the 
state of New York, forms the whole contour of Lakes Erie and 
St. Clair,” &c. Now the extension of those rocks occupying 
southern New York, and along the shore of Lake Erie, to form 
its ‘‘ whole contour,” comes thence into Ohio, not by any identi 
fication or parallelism, by lithological or fossil affinities, but by 
absolute continuity. Yet our author describes first his Devoniat 
as forming the contour of Lake Erie, and afterwards represents 
e s, the bituminous shale and Waverly sandstones of 
Ohio, as carboniferons,—these very rocks themselves forming the 
southern contour of Lake Erie. 
We have thus run over the work to the 33d page, and here 
leave it. One point only we will notice. The sandstone of 
Lake Superior is classed as the New Red, notwithstanding all 
the labors of Logan, Owen, Foster and Whitney, and others, who 
have agreed in considering it lower Silurian. 
” 
