. The Canadian naturalist and geologist. Natural history -- Periodicals. 282 On the Track of an Animal lately found the sea to which it belonged. These localities are St. Ann, Yau- dreuil, Presqu'ile, Lachute, and St. Elizabeth, and they were last year observed in the neighbourhood of Perth. In the last locality they are associated with a new and remarkable description of track for the discovery of which we are indebted to my friend Dr. James Wilson of Perth, who sent me specimens of it in the month of November last. The largest of the specimens was between two and three feet long by a foot wi
. The Canadian naturalist and geologist. Natural history -- Periodicals. 282 On the Track of an Animal lately found the sea to which it belonged. These localities are St. Ann, Yau- dreuil, Presqu'ile, Lachute, and St. Elizabeth, and they were last year observed in the neighbourhood of Perth. In the last locality they are associated with a new and remarkable description of track for the discovery of which we are indebted to my friend Dr. James Wilson of Perth, who sent me specimens of it in the month of November last. The largest of the specimens was between two and three feet long by a foot wide, and the track upon it so singular that I became desirous of obtaining a greater extent of the trail. For this purpose, in the beginning of Deccember, I sent Mr. Richardson to Perth, where he was guided to the quarry by Dr. Wilson, and shewn the bed in which the tracks occur. The quarry, of which the strata are nearly horizontal, is about a mile from the town, and with the aid of Mr. Glyn, the proprietor, Mr. Richardson obtained in fragments, a surface which measures about seventy-six square feet. To obtain this required a good deal of patience, for there was half a foot of snow on the ground, and from under this it was necessary to remove between two and three feet of rock in order to reach the bed The rock is a fine grained white sandstone similar to that in which the Protichnites occurs at Beauharnois, and of that pure silicious character which is so well known to belong to the Pots- dam formation wherever it is met with. The tracks are impres- sed on a bed which varies in thickness in different parts from one eighth of an inch to three inches. When the upper bed was removed large portions of the track-bearino; bed came away with it, and it was necessaryto separate the layers. This was done by heating the surface with burning wood placed upon it, and then suddenly cooling it by the application of snow. This of course cracked and destroyed the thin bed with the impressed t
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