A List of Minerals and Organic Remain: 69 
are nearly transparent, almost cylindrical, with the excep- 
tion of a few, which belong to the a and tri-uni- 
we of Baily. The same form is found at Franklin, New- 
aan 1% oa i 
oe 
=. 
Glassy tremolite.—York, U. C. In white, glassy, short 
and indistinct diverging fibres, dispersed among the peta- 
lite, minutely, and in large masses. e 
Petalite.—This rare mineral, not hitherto found on this 
continent, occurs on the north shore of Lake Ontario on the 
&. ita % 
and has much glassy tremolite interspersed, and two large 
veins of irregular shape, of an aggregate of actynolite and 
calc. spar. Close to this bowlder lies a still larger of the 
ophiealcic family} from Grenville or Gananoque, and strewn 
around are loose greenstones, sienites and some Labrador 
feldspar. ‘ 
The town of York is situated on clayey alluvion, con- 
taining in spots, many crystalline quartz nodules; the an- 
cient banks of the Lake are about a mile in the rear ; but at 
the distance of several miles east and west, they form its 
immediate shores in the slopes of the “ Burlington Heights” 
the very picturesque cliffs of the “ York Highlands” 
three hundred feet high, and consisting of grey and blue 
clay, which now and then alternate with horizontal bands of 
ferruginous sand. fe te 
t York the alluvion overlies a brown horizontal lime- 
stone, abounding in trilobites, orthoceratites, and other 
fossils of the older secondary formations, and abutting 
horthwardly, forty miles from Lake Ontario, on gneiss and 
slenitic rocks. 
Anthophyllite.—Fort Wellington, U. C. In a large rol- 
led aggregate of crystallized quartz, calc, spar and apatite. A 
remarkably well characterized example, recognized by Dr. 
Hyde Wollaston, and Mr. Lowry of London. [had con- 
sidered it zoisite. 
* Dr. Troust, Journal of the Academy of Nataral Science, of Philadel- 
Phia, Vol. 3. p.234. 
* A term used by the French Geologists to designate a rock composed of 
marble and serpentine. 
iy 4 
