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Miscellanies. 191 
16. Evidences of diluvial-currents—petrifactions—metallic models of 
shells, To Prof. Suoman & Son: Gent.,—Herewith I send you speci- 
mens of the surface rock in this vicinity. The Jarge slab, containing 
chert, was taken from the village of Black Rock, about four miles north 
of this city. -The grooves at this locality, as determined by Mr. agen 
and myself, range, allowing for-variation, N. 28° 12 E 
You will perceive, that wherever a nodule of chert projects above a - 
surface, a ridge of the softer limestone has been protected, in some 
measure, from friction, which invariably, at this locality, as well as at the 
Black Rock quarry, one and a half miles distant, point in a southerly di- 
rection. Some parts of the surface rock, where this slab was ‘procured, 
present this phenomenon much more perfectly; the nodules of chert 
often having a semi-circular depression worn into the rock on their north- 
ern sides, opposite to the projecting ridge. I regret that such a specimen 
could not be procured, as the strata on which ey occur are from one foot 
- to one and a half feet in thickness. 
Can proof be more conclusive, that these siatie and eietithiens were 
produced by gravel stones and boulders, swept over the surface of the 
Tocks by currents, tides, or waves, which flowed from the north? 
- I also send a smaller slab, somewhat polished. It one about 
half a mile further north, but as no marks appear : 
could not determine precisely the course from which the water flowed. | 
At Black Rock quarry, where a large surface has been uncovered for 
the purpose of procuring materials to construct the breakwater, outside of 
Buffalo harbor, the grooves range N. 15° 32’ E. The friction there has 
been equally powerful; but as the rock consists almost entirely ge chert, 
ise —— pointing towards the south are less prominent. 
Talso put into the box a piece of weathered chert, from which short car- 
scant of lime has been decomposed. The workmen here sometimes 
call this “chawed stone.” I add also some madr , and metallic 
casts of two mesa enaperen te — ere: ‘able en 
A 
— single specimens. 
Hoping that the box and its contents will 7 2 acceptable, I yestiaies, 
yours truly, &e. : Geo. E. Haves. 
The box was highly aicepiniie, cone as the proofs of powerful 
and lasting diluvial action are decisive on the slab of limestone, as well 
as on the pieces which we have recently seen at Buffalo, in the poegneson 
of Mr. Haskins and Dr. Hayes. —Eprrors. 
17. The American Almanac, and Rapesiloty Ff Useful): Knowledge, 
for the year 1839. Boston, Chas. Bowen. Vol. 10.—This valuable work, 
for the ensuing year, has been forwarded to us by its Editor, Mr. J. E 
Worcester. ‘To it is appended a general index of the last ten volumes, 
