_ 322 On the Geological Position of the 
Cincinnati itself. ‘These facts show that some large erratics have taken 
up their present position since the older alluvium of the Ohio valley was 
deposited. In travelling northwards from Cincinnati towards Cleve- 
land, Mr. Lyell found the northern drift commence in partial patches 
twenty five miles from the former city and about five miles northeast of 
Lebanon, after which it continually increased in thickness as he pro- 
ceeded towards Lake Erie. 
New York: Niagara Falls.—In a former paper Mr. Lyell alluded to 
the position of the remains of Mastodon, twelve feet deep, in a fresh- 
water formation on the right bank of the river Niagara at the Falls. He 
remarks that if we had not been able to prove that the cataract had re- 
ceded nearly four miles since the origin of the fluviatile strata in ques- 
tion, we should have been unable to assign any considerable duration of 
time as having intervened between the inhumation of the Mastodon in 
mar! full of existing shells and the present period. | The general cover- 
ing of drift between Lakes Erie and Ontario is considered to be of much 
higher antiquity than the gravel containing the bones of the Mastodon 
at the Falls. 
Rochester.—In the suburbs of this city remains of the Mastodon gi- 
ganteum were found associated with existing species of Mollusca in grav- 
el and marl below peat. 
Genesee.—Here remains of the Mastodon gigantewm were found with 
existing shells in a small swamp, in a cavity of the boulder formation, 
so that the animal must have sunk after the period of the drift, when @ 
shallow pond fed by springs was inhabited by the same species of fresh- 
water Mollusca as now live on the spot. 
Albany and Greene Counties.—Mr. Lyell examined, in company with © 
Mr. Hall, two swamps west of the Hudson River, where the remains of 
Mastodon occurred in both places at a depth of four or five feet, pre 
cisely in such situation as would yield shell marl, and peat, with re- 
mains of existing animals in Scotland. Cattle have recently been mit- 
ed in these swamps. 
According to Mr. Hall the greatest elevation at which Mastodon bones 
have been found in the United States is at the town of Hinsdale, situa- 
ted on a tributary of the river Alleghany in Cattaraugus County in the 
State of New York, where they occur at an elevation of fifteen hundred 
feet above the level of the sea. : 
Maryland.—In the museum at Baltimore, Mr. Lyell was shown the 
grinder of a Mastodon, distinct from M. giganteum, and which had bee? 
recognized and labelled by Mr. Charlesworth as M. longirostris, Kaup- 
It was found at the depth of fifteen feet from the surface in a 
marl near Greensburg, in Caroline County, Maryland, and is considered 
by Mr. Lyell as a meiocene fossil. 
