On the Foot-prints occurring in the Postdam Sandstone of Canada

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Abstract
Since the reading of the paper communicated to the Society last year on the track and footsteps of an animal in the Potsdam Sandstone of Lower (East) Canada, the lowest member of the Lower Silurian rocks, farther investigation by my assistants on the Provincial Survey and myself have brought to light a considerable number of similar tracks in the same rock; and, although quite convinced in my own mind of the age of the rock, the importance attached to these impressions has induced me to search for additional evidence on the point, in order that others as well as myself might be satisfied that no mistake had been made in regard to it.

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