Diller made careful observations of Cinder Cone and interviewed many Native Americans and European trappers and settlers who were in the Lassen region in 1850.
None of them could recall witnessing any volcanic activity in the area.
The cone was built to a height of 750 feet (230 m) above the surrounding area and spread ash over 30 square miles (78 km).
Then, like many cinder cones, it was snuffed out when several basalt lava flows erupted from its base.
Cinder Cone is a cinder cone volcano in Lassen Volcanic National Park (located in Northern California in the United States).