Continue reading At its summit lies the Newberry Caldera, a massive 4-by-5-mile depression formed by a cataclysmic eruption approximately 75,000 years ago. Within this caldera rest two serene ...

Tim Neville The Newberry National Volcanic Monument is ... that formed inside a 17-square-mile caldera—a crater-like depression left after a volcano's magma chamber empties and collapses.