Geology and Minerals
Billy Mitchell is a dormant pyroclastic shield volcano in central Bougainville, just north-east of the Bagana Volcano in Papua New Guinea. It is a small pyroclastic shield truncated by a 2 km wide caldera filled by a crater lake. It is named after Billy Mitchell, a 20th-century United States Army general who is sometimes regarded as the father of the United States Air Force.
Chantilly, Oise.
Geology of the Zion and Kolob canyons area.
Text from Wikipedia; plate via Wikimedia Commons. Text CC BY-SA 4.0; plate freely licensed (see Commons). Source record. Images and catalogue data are reproduced from open-access collections.