Mineralogy and Geology. 115 
The author describes fifteen different forms of vegetable remains, of 
which, however, only nine or ten are sufficiently well preserved to be 
determined with any precision. Six are Ferns, of which three 
to Pecopteris, one to Teniopleris, one to Neuropteris, and the sixt 
species characteristic of the oolites of the Yorkshire coast. There is 
one species of Equisetum,—E. columnare—likewise characteristic of 
the Yorkshire oolites; one, or perhaps two of Ca/amites ; two ich 
may possibly be mere varieties) of Zamites ; the remainder are obscure 
impressions of an equivocal nature, but of which one has a certain de- 
gree of resemblance to a Stigmaria, and another to a Lepidodendron. 
Five of these fossil plants had previously been determined and de- 
scribed by Prof. W. B. Rogers, namely, Teniopleris magnifolia, Pe- 
copteris whitbiensis, Equisetum columnare, Calamites arenaceus, an 
Zamites obtusifolius. Prof. Rogers described also a few other species, 
which do not occur in the collection made by Mr. Lyell. 
From a comparison of these vegetable remains with those found in 
European strata, of which the geological position is well known, It 
may be concluded with tolerable certainty, that the Richmond coal- 
part of the Triassic series,—more robably tothe: forerty ities 
e southern 
»f Lake Superior ; by Forrest SHEPHERD, (communicated by 
request, to Prof. Silliman, for this Journal.)—The mass of native cop- 
r in my possession, was discovered on the southern shore of Lake 
Superior in July, 1845, by Tousant Piquette (an Indian of the Ojibwa 
tribe) in or near latitude 47° 5’ north, ong 
It is composed almost entirely of pure native copper with spots of 
re metallic silve its surface, toge 
Spi af cptniics anotiene ap ate siropgly-imbedded and fastened in 
Its length is about three feet and a half, 
metal, while the other side, nearly flat, appears much worn and pol- 
ished in some places, whilst in other places it exhibits numerous grooves, 
Scratches and broad longitudinal furrows, showing evidently that the 
mass has at some period been subject to 
syenite, sandstone, &c., and also an undecaye lo; 
bor vite) on which it rested. Around it, both in the lake, and upon 
