Pillow basalt and palagonite, part of Columbia River Basalt Group, formed by lava flowing into a lake during the Miocene.

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Note the jointed basalt above the pillows --and the transitional nature of their contact. The lava first poured into a lake to form the pillows, but then filled the lake and the later part of the lava flow simply flowed over land!

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Size: 4950px × 3301px
Location: Oregon, USA
Photo credit: © Marli Miller / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: basalt, bedrock, colonnade, columbia, columnar, delta, earth, geology, history, igneous, jointing, lava, miocene, nature, oregon, palagonite, pillow, river, rock, science, states, transgression, united, usa, view, volcanic, wanapum