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Pillow Basalt - Mary's Peak, Oregon by ScottJohnson

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About This Gigapan

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Taken by
ScottJohnson ScottJohnson
Explore score
1
Size
1.40 Gigapixels
Views
640
Date added
Jul 14, 2013
Date taken
 
Categories
geology
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Competitions
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Description

The many round shapes you can see in this outcrop are pillows of basalt, formed when lava erupted from the seafloor and cooled quickly in blobs roughly 50 million years ago.
The radial cracks some of those pillows show are due to the fact that they cooled from the outside in. You can see outer layers on some of the pillows- that's the portion that cooled fastest since it was in direct contact with the water.


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