OF NORTH AMERICA. 
93 
In like manner he traces another similar belt of carboniferous rocks to the southward of the Cin- 
cinnati axis, connecting the east and west coal field. The idea many years since promulgated that the 
Waverly sandstone of Ohio did pass around to the south side of this elevation, was long since proved 
otherieise; and no geologist for the past seven years would have ventured to republish an exploded error. 
The union of the coal field of Missouri and Iowa with that of Arkansas is without authority («I am 
the authority.-!) — J. Marcou.); and so also the extension of lower carboniferous over so great a breadth 
of territory to the westward. 
The Devonian formations, which on the map are colored in a broad belt through New York and 
thence narrowing westward to Cleveland and Sandusky, are there represented as cut off by the belt of 
lower carboniferous, before mentioned, which runs westward to the lllionois coal field. Now the fact 
is, that the formations traced through southern New York and thence to Cleveland, are absolutely and 
unmistakeably continuous along the western margin of the great Alleghany coal field , through Ohio and 
Kentucky, and oven into Tennessee and Alabama. 
Our author has recognized the formation about Richmond, Va. as Liasic, while the same formation 
in North Carolina is colored as New Red Sandstone. Wo do not discuss the question of the ago of the 
New Red or Triassie of Connecticut Valley and further south : we only say here that there is no reason 
whatever for regarding that of North Carolina as differing in age from that of the Richmond basin. 
There are other errors with regard to regions less known, as, for example, that of extending the 
cretaceous area to the east side of the Missouri for several hundred miles above Council Rluffs; and of 
terminating the same formation on the northwest more than a hundred miles short of its known limits. 
But these are excusable, compared with many points we have passed in review. 
This article is anonymous, but its author is considered to be, without doubt, James Hall of 
Albany. 
***»» »»»»**»« .**# 
(Extract from the Silliman's Journal of Science , second series, vol. XIX, N'’ 57, p. 359. May, 1855. New Haven.) 
REVIEW OF xMURCHISON'S SILURIA. 
In this article, signed with the initials J. D. W. , which probably mean J. D. Whitney, the 
assistant of James Hall for the Geological Survey of the State of Iowa, a note beneath page 379 reads 
as follows: 
«Murchison has been, in several instances, led into great errors by adopting M. Jules .Marcou as 
« one of his American authorities. Thus he has failed to recognize the unconformability of the Lower 
« Silurian and the .Azoic in the Northwest, a well-established fact. We take the liberty of referring the 
« author to Silliman’s Journal for March 1854, whore he will find Mr. Marcou’s geological knowledge of 
«the United States discussed, and we have little doubt that, after examining that article, he will prefer 
«to consult more reliable authors ». 
(Extract from the Silliman's Journal of Science, second series, vol. XIX, N*’ 57, p. 397. M,iy , 1855. New Haven.) 
EMMONS ON AMERICAN GEOLOGY. 
This anonymous article, due however to the same pen, of James Hall of Albany, commences 
by the following attack upon me : 
« The laborious investigators of our American geology can scarcely find time for the preparation 
« of popular treatises, which shall embody the results of their researches, and the consequence too often 
«is that this labor is left for those who are most unfit for the task. It is but a few months since an- 
