358 
[Assembly 
On the shore of Lake Ontario, north of Yates^ centre, and ten miles 
from Medina, the sandstone is red and variegated, and contains similar 
marks, or furrows, whose direction is north and south, and also north 
20° east. These layers are at a depth of more than 500 feet in the 
sandstone. 
Similar appearances are presented at Holley, on a layer of sandstone^ 
which also contained an individual of the fucoides Harlani, which had 
evidently bent and followed the irregularities. Direction of the fur- 
rows not ascertained. 
I have examined similar furrowed surfaces, or water-worn surfaces, of 
the Graywacke at Saugerties, on the Hudson river; they are common in 
the shales and sandstones of the Catskill mountain; and I have also ob- 
served them on layers of a dark, compact limestone, which is quarried 
at Glasco, three miles west of Saugerties. 
Similar appearances have been noticed in Great Britain. In 1831, 
Mr. G. P. Scrope, after visiting the quarries of Dumfries, found ripple 
markings, and abundant foot tracts of small animals, on the Forest-mar- 
Dle beds north of Bath.— Phil. Mag. 1831, p. 376. 
We have not seen any bird-tracks, or other impressions of animals, 
in the Fourth Geological District. 
Limestone, 
Thin layers of limestone are extracted from the bed of Oak Orchard 
creek, between Medina and Shelby, and used at the former place for 
flagging. They appear to be of a siliceous character, occur in large 
slabs, and the surfaces are frequently covered with fossil vegetables of 
the family of fucoides; they strongly resemble the petrified stems of ve- 
getables. 
Williams' quarry, in the the northeast part of the town of Barre, 
furnishes a siliceous, or sandy limestone, at present used for fences and 
underpinning, and which resemble the rock employed in Monroe county 
for the preparation of water cement. 
A gray, porous, siliceous limestone is quarried at FarwelPs mills. 
Clarendon centre, and used in buildings. Some of the layers contain 
a considerable proportion of lime, although they mostly consist of a 
porous, flinty rock, much resembling the French Buhrstone. The 
quarry is quite extensive, and occupies the summit of the ridge which 
overlooks the village. The layers are large, and from one to three feet, 
