ignimbrite
/ˈɪɡnɪmbraɪt/
noun
- A rock formed from volcanic ash and fragments that were deposited by a very hot, fast-moving cloud of gas and ash (a pyroclastic flow).
- Geologists studied the ignimbrite layers to understand the history of the volcano.
- The quarry extracted ignimbrite for use in building stone and decorative gravel.
- The cliffs along the valley were made of ignimbrite from an ancient volcanic eruption.