this post was submitted on 01 Jun 2025
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Cheswick Sands, Northumberland, UK.

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[โ€“] [email protected] 3 points 1 month ago (1 children)

Looks like hardened lava flow. Is that what this is?

[โ€“] [email protected] 6 points 1 month ago

Nope. Cross-stratification in sandstones. Each curved layer represents an ancient dune or ripple that migrated across a river channel or shallow sea floor.