Sioux Quartzite (Paleoproterozoic, 1.65-1.70 Ga; Falls Park, Sioux Falls, South Dakota, USA) 6
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Yavapai Geology Museum (U.S. National Park Service)
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nps.gov
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PROTEROZOIC EON Introduction The Proterozoic Eon is the geological eon that lasted from about 2.5 billion years ago (Ga) to 541 million years ago (Ma), coming after the Archean Eon and before the Phanerozoic Eon. It is one of the most significant intervals in Earth’s history, as it witnessed major geological, biological, and atmospheric changes that set the stage for complex life. FEATURES 1. Continental Development Stable cratons and large continental landmasses formed. Supercontinents such as
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