Exfoliation joint

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Science and technology

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What Wikipedia says

Exfoliation joints or sheet joints are surface-parallel fracture systems in rock, often leading to the erosion of concentric slabs.

Excerpt from the Wikipedia article “Exfoliation joint”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Rémih, CC BY-SA 4.0, via Wikimedia Commons.