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Based on extraterrestrial chromite grains (63–355 μm) in late Eocene sediments, the Chesapeake Bay impact crater (northeastern United States; 40–85 km diameter) likely formed from an H-chondritic projectile. This impact occurred 10–20 k.y. after the formation of the Popigai crater (Siberia, Russia; ∼100 km). The craters formed at the peak of a 2-m.y. period with a factor of 3–5 enhanced flux of 3H
