Big Obsidian Flow, Oregon

photo of Big Obsidian Flow, Oregon

Aerial view from the south of Big Obsidian Flow in Newberry Caldera, Oregon. This thick rhyolite flow was erupted about 1300 years ago and covers more than a square mile. The dome-shaped mound over the vent and the concentric pressure ridges indicate the flow was very viscous.

Photo copyright R.A. Jensen.

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