References to North American Localities. — 153 
stood. Our state — it is to be hoped, will adopt the 
maxim, *“ verbum sa 
On reviewing my pen and specimens since I wrote the article 
of Vol. xxxv1, p. 61, (to which I refer the reader ,) [feel compelled 
to say, that the omtnikacwnin limerock is equivalent to some part 
or most of the grauwacke group of De La Beche, the grauwacke 
limestone of some English writers, the grauwacke slate of Bake- 
well, perhaps the carboniferous rock of Conybeare; and surely 
the upper transition (or one of the Psammite) rocks of Brongniart. 
It is true, that in our country, it is uniformly, almost wholly, a 
limerock, and always contains hornstone. But its relative posi- 
tion, and its numerous organic remains, are unequivocal. I have 
found in corniferous limerock, (and have them now before me,) 
seven species of Cyathophyllum, one Producta, one Belerophon, 
two Orthocera, one Calymene, and one Asaphus, which De La 
Beche quotes as being found in the equivalent rock in Europe, 
which he places in his grauwacke group. 
If we should consider our rock as extending upwards in alter- 
nating portions, so as to compass all De La Beche’s grauwacke 
group, we might attempt to make out the following equivalents. 
Beginning on the encrinal limerock at Fort Plain on the Mo- 
hawk, we find real carboniferous grauwacke, containing thin lay- 
ers of anthracite, and three species of trilobites. On this, if we 
proceed southwesterly, we find the red sandstone, containing vast 
salt springs, froma little west of Utica to Queenstown in Canada, 
beyond Niagara River. For fer carbonate of Brongniart we find 
a vast stratum of lenticular iron ore. Our fetid stratum of geo- 
diferous limerock containing gypsum may be the calcaire | 
et gypse of Brong. And our hydraulic cement, liasoid, 
may be at least compared with the Has of Europe. Ido not pro- 
nounce these to be equivalents, as they may be an older exhibi- 
tion of a repeated groupe But “ the een to our cornifer- 
ous limerock isremoved, t e 1, and their 
organic relics carefully compared. In this case, organic remains 
alone must decide, on account of the vague character of Euro- 
pean grauwacke. 
Limit between Secondary (Pelagient) and Tertiary (Thalas- 
sient 
rhe limit between. Brongniart’ 's secondary and tertiary depos- 
its is most perfectly and definitely presented along the south 
shore of Raritan Bay in New Jersey, apes South Amboy to Nev- 
~ Wol. xxx1x, No. 1.—April-Jane, 1840. 
