In more recent history, around 400,000 years ago, runny basaltic lava from Newberry Volcano to the south flowed over much of the tuff, leaving only the tall spires exposed above the flow.

What landscape architects need to know. The country's fiery liquid landscape shifts, on a massive scale. By Michael Dumiak ...

The last eruption in the region — a lava flow — was over 70,000 years ago ... Seismic imaging of the Yellowstone system has also identified a deeper magma body, likely composed of basalt — Earth’s ...

The last eruption in the region — a lava flow — was over 70,000 years ago ... likely composed of basalt — Earth’s most primitive magma type and the heat engine that helps to generate ...