Geologic History
Virtually all the potable water consumed in the Centre Region is drawn from the groundwater reservoir. Even residents in the Bellefonte area depend on groundwater that emerges naturally in the Big Spring. But the movement of water on and beneath the surface is controlled by the rocks and structures that shape the valley. Figure 1. Paleogeographic globe with present-day North America superimposed on the American landmass of c. 450 Ma. (White dashed line is the equator; nort