 The earliest settlers in Pennsylvania arrived from Asia between 12000 BCE and 8000 BCE , when the glaciers of the Pleistocene Ice Age were receding . Fluted point spearheads from this era , known as the Paleo @-@ Indian Period , have been found in most parts of the state . Archeological discoveries at the Memorial Park Site 36Cn164 near the confluence of the West Branch Susquehanna River and Bald Eagle Creek collectively span about 8 @,@ 000 years and represent every major prehistoric period from the Middle Archaic to the Late Woodland period . Prehistoric cultural periods over that span included the Middle Archaic starting at 6500 BCE ; the Late Archaic starting at 3000 BCE ; the Early Woodland starting at 1000 BCE ; the Middle Woodland starting at 0 CE ; and the Late Woodland starting at 900 CE . First contact with Europeans occurred in Pennsylvania between 1500 and 1600 CE . 
 The earliest settlers in Pennsylvania arrived from Asia between 12000 BCE and 8000 BCE , when the glaciers of the Pleistocene Ice Age <a href='uninflect' title='1'><mark>were</mark></a> receding . Fluted point spearheads from this era , known as the Paleo @-@ Indian Period , <a href='been_done' title='2'><mark>have</mark></a> been found in most parts of the state . Archeological discoveries at the Memorial Park Site 36Cn164 near the confluence of the West Branch Susquehanna River and Bald Eagle Creek collectively span about 8 @,@ 000 years and represent every major prehistoric period from the Middle Archaic to the Late Woodland period . Prehistoric cultural periods over that span included the Middle Archaic starting at 6500 BCE ; the Late Archaic starting at 3000 BCE ; the Early Woodland starting at 1000 BCE ; the Middle Woodland starting at 0 CE ; and the Late Woodland starting at 900 CE . First contact with Europeans occurred in Pennsylvania between 1500 and 1600 CE . 
The earliest settlers in Pennsylvania arrived from Asia between 12000 BCE and 8000 BCE , when the glaciers of the Pleistocene Ice Age was receding . Fluted point spearheads from this era , known as da Paleo @-@ Indian Period , done been found in most parts of the state . Archeological discoveries at the Memorial Park Site 36Cn164 near the confluence of the West Branch Susquehanna River and Bald Eagle Creek collectively span bout 8 @,@ 000 yrs and represent every major prehistoric period from tdaMiddle Archaic to thdaate Woodland period . Prehistoric cultural periods over dat span included thedaddle Archaic starting at 6500 BCE ; the dae Archaic starting at 3000 BCE ; the Early Woodland starting at 1000 BCE ; the Middle Woodland starting at 0 CE ; and the Late Woodland starting at 900 CE . First contact with Europeans occurred in Pennsylvania between 1500 and 1600 CE .