i42 Native Crystallized Carbonatc of Magnesia. 
tinguished from the coralline chert of the previous beds, are 
the most beautiful which have any where been yet noticed; 
and when well selected and polished, make very pleasing orna- 
ments. 
This Island, as well as Barbuda, thirty miles to the north- 
ward, the Grande Terre part of Guadaloupe, at a similar dis- 
tance to the southward and eastward, with several others of 
the West-India Islands, gives proof of an extensive formation, 
more recent than those to which naturalists have heretofore 
principally confined their attention ; and which is, perhaps, 
contemporaneous with, if not later than, the Paris Basin, s¢ 
well described by Cuvier and Brongniart. 
- April 10th, 1818. N.N. 
N.B. A few specimens are sent. 
Remarks. 
If the above paper be read attentively, in connexion with 
that in No. 1, on the petrified wood of Antigua, it will aff 
some very curious information to the geologist respecting these 
petrifactions, and must lead to interesting speculations 1 
specting their origin, under circumstances so very peculiar, and 
to which we do not recollect to have heard of any parallel. 
Art. IX. Discovery of Native Crystallized Carbonate of Mag- 
nesia on Staten-Island, with a Notice of the Geology and 
Mineralogy of that Island, by James Prence, Esq. of Net 
York—in a Letter to the Editor. 
New-York, Oct. 19, 1818 
Dear Sir, 
I FORWARD you a few mineral specimens, characteristic of 
Staten-Island, including native carbonate of magnesia, in a¢ 
cular crystals. I discovered this new form and locality of mas” 
ae 
