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 

 marl 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 giganteum 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 a 

 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 mir- 

 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 been 

 recognized and labelled by Mr. Charlesworth as M. longirostris, Kaup. 

 It was found at the depth of fifteen feet from the surface in a bed of 

 marl near Greensburg, in Caroline County, Maryland, and is considered 

 by Mr. Lyell as a meiocene fossil. 



