References to North American Localities. 153 



stood. Our state geologists, it is to be hoped, will adopt the 

 maxim, -^ verbum sat.^^ 



On reviewing my notes and specimens since I wrote the article 

 of Vol. XXXVI, p. 61, (to which I refer the reader,) I feel compelled 

 to say, that the corniferous limerock is equivalent to some part 

 or most of the grauwacke group of De lia 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. Bat 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 ihe red sandstone, containing vast 

 salt springs, from a little west of Utica to Queenstown in Canada, 

 beyond Niagara River. For/er 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 fetide 

 celluleux et gypse of Brong. And our hydraulic cement, liasoid, 

 may be at least compared with the lias of Europe. I do not pro- 

 nounce these to be equivalents, as they may be an older exhibi- 

 tion of a repeated group. But if the objection to our cornifer- 

 ous limerock is removed, these rocks ought to be reviewed, 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). 



The 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, from South Amboy to Nev- 



Vol. XXXIX, No. 1.— April-June, 1840. 20 



