During the summer of 1902 the writer made a collection of Ordovician fossils in the neighborhood of Bellefonte, Pennsylvania, for purposes of future comparison with faunas of like age in Wisconsin.

Several interesting features were brought out during the study of the Pennsylvania material, and a preliminary account of them is presented in this paper.

Bellefonte is the county seat of Center county, the geographical center of the state, as the name indicates. The town lies in Nittany valley, a denuded anticline, which affords exceptionally good exposures of the Ordovician rocks. The particular section described in this paper extends from the tollgate one mile south of Bellefonte to the entrance of Milesburg gap, north of the town. The best exposures are at the city laundry, near the Nittany Valley Iron Company’s furnace in Bellefonte, and in the northern environs of the town along the Milesburg turnpike.

According to Rogers: . . .

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