This area features andesitic and mafic cinder cones such as Lava Butte , as well as rhyolite domes .
The region was active in the Pleistocene , with eruptions between about 650,000 and about 250,000 years ago from an explosively active complex known as the Tumalo volcanic center .
This area features andesitic and mafic cinder cones such as Lava Butte , as well as rhyolite domes .
The region was active in the Pleistocene , with eruptions between about 650,000 and about 250,000 years ago from an explosively active complex known as the Tumalo volcanic center .