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Penn's Woods: The History of Pennsylvania's Forests: "The first people came to the land we call Pennsylvania at the end of the last ice age. Evidence of the ancient forests they explored can still be found. Pollen grains are preserved for centuries in the muck of bogs. They show us what plants were growing in the area long ago. Scientists study the bones of prehistoric animals found in caves and sinkholes. These clues and the stone tools left behind by the early inhabitants tell us their story." Read more from Penn's Woods