The vicinity of Jamesville, Onondaga County, New York, is classic ground to both the geologist and the botanist. Across the outcropping Onondaga limestone on both sides of and above the present level of the valley of the Butternut creek and almost at right angles to the present north and south placement of the valley are the famous postglacial gorges caused by the eastward flow of the outlets of the postglacial Lake Onondaga. In 1807 Pursh discovered the Hart 's-tongue fern near Geddes, southwest of the city of Syracuse. In 1830, William Cooper found the fern at Chittenango Falls, a few miles southeast of Syracuse. Meanwhile the two localities where the fern was most abundant remained unknown until found by Lewis Foote in 1866 near Jamesville, and in the same year by J. A. Paine, Jr., at Little Lakes (Green pond and White or Blue lake), about a mile east of Jamesville. Two small bodies of water, Green lake (2 miles west of Jamesville) and Green pond (1 mile east of Jamesville) occupy the plunge basins of waterfalls along the course of the extinct postglacial rivers, the beds and gorges of which form such a conspicuous element of the local geology. It is probable that Rafinesque visited one
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