American Geological Society. 144 
cers. 
William Maclure, President. 
George Gibbs, 
T. D. Porter, Curator. 
A. M. Fisher, Treasurer. 
Benjamin Silliman, ; B. Silliman, Committe 
Parker Cleaveland, | Vice- | G. Gibbs, - Moms. 
Stephen Elliott, Presi- | P.Cleaveland,( ~~. 
R ination. 
Robert Gilmor, Jr. ¢ dents. . Hare, 
Samuel Brown, — . George Gibbs, ) Committee 
Robert Hare, JILWW. at of Pub- 
{ Vacant. ] J James Pierce, lication. 
L’. Dwight, Porter, Rec. Sec. 3 
JW. Webster, 
F.C. Schaeffer, ' Corresponding Secretaries. 
E. Hitcheock, pe hy . ane 
The stated meeting for December having been postpon- 
ed, a special meeting was held on the 26th of January, 
1820, in the new Cabinet of Yale College. 
_ Col. Gibbs, as first Vice President, took the chair. 
Professor Silliman presented a memoir of considerable 
extent on parts of the counties of New-Haven and Litch- 
field, in Connecticut. He gave a connected view of the stra- 
ta and formations from the old red sand stone, the green 
stone trap, and alluvial of New-Haven, through the succeed- 
ing clay slate, chlorite slate, and micaceous slate, to the 
Gneiss and Granite of the Alpine region of Litchfield coun- 
_ The extensive beds of white granular marble which al- 
ternate many times with the mica slate and gneiss of Litch- 
field county, and afford inexhaustible materials for archi- 
tecture and the arts, were particularly noticed, as were the 
fine iron ore beds of Salisbury and Kent, and the spathic 
iron of Roxbury all of which are also situated in the gneiss 
and mica slate. 'Tremolite, garnet, staurotide, sappar, plu- 
Mose mica stalactitical brown iron and graphic granite, oc- 
curred in fine specimens, in the tract described, and speci- 
mens of most of these were presented for the cabinet of 
the Society. : 
The same gentleman presented specimens of massive 
fluor spar, regently discovered iu the parish of New-Strat- 
