The layer of ash is from the eruption of Mount Mazama in southern Oregon, deposited 7,700 years ago following a cataclysmic eruption of the volcano. Mount Mazama is part of an arc of volcanoes ...

Mount Mazama was a composite volcano – a very large, tall volcano composed of lava flows, pyroclastic deposits (volcanic fragments of pumice and ash), and mudflow deposits. Situated within the Cascade ...

More than 7,700 years ago, an ancient volcano named Mount Mazama erupted and caused the peak to collapse in on itself. Over the centuries, snowmelt and rainwater filled the yawing crater to create ...

An award-winning George Henderson photo of George Riggs and Ranger greeting the sunrise on April 28, 1935 on the south side of Mount Hood. Photos in the Mazama Library & Historical Collections ...

A Mazama High School student was taken into custody Tuesday morning after police found a gun on campus. According to the ...