Since the glaciers retreated approximately 12,000 years ago, natural features and resources (the night skies, geology, flora and fauna, and scenic waterways) have attracted people to the present day area of Katahdin Woods and Waters National Monument. Among the defining natural features of the monument is the East Branch Penobscot River system, including its major tributaries, the Seboeis River and the Wassataquoik Stream, and many smaller tributaries. Known as one of the least developed watersheds in the northeastern United States, the East Branch Penobscot River system has a stunning concentration of hydrological features in addition to its significant geology and ecology. Various formations in the area provide striking visual evidence of marine waters in the monument during the geologic periods that immediately followed the Cambrian period (approximately 541 million years ago to 485.4 million years ago).
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