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In page Palmyra, Pennsylvania:

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Palmyra lies in the eastern section of the Great Valley, locally known as the Lebanon Valley. The specific formation beneath Palmyra is an Ordovician Epler Formation, characterized by a high number of surface depressions and sinkholes. These features serve as natural drains, allowing any water on the surface to permeate the soil and run underground into water tables or into local springs or creeks.[citation needed]