 Plunketts Creek 's unique name comes from the first owner of the land including the creek 's mouth , and the creek has given its name to two townships ( although one has since changed its name ) . The creek flows southwest and then south through the dissected Allegheny Plateau , through rock from the <unk> sub @-@ period and Devonian period . Much of the Plunketts Creek valley is composed of various glacial deposits , chiefly alluvium . 
