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Tyee Formation turbidites by ScottJohnson

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About This Gigapan

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Taken by
ScottJohnson ScottJohnson
Explore score
1
Size
6.14 Gigapixels
Views
516
Date added
Feb 02, 2014
Date taken
Feb 01, 2014
Categories
geology
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Description

What look like alternating light and dark layers are repeating sequences of submarine landslides called turbidity currents. When the sediment stops coursing downslope, the larger grains drop down first (the light gray layers here are sandstone) and the finer grains slowly settle out on top (dark layers- siltstone).
These particular underwater landslides occurred about 40 million years ago, on the edge of sediments deposited by a river meeting the sea.


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