Muschelkalk

Rarity: Common

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What Wikipedia says

The Muschelkalk (German for "shell-bearing limestone", pronounced [ˈmʊʃl̩ˌkalk] ) is a sequence of sedimentary rock strata (a lithostratigraphic unit) in the geology of central and western Europe.

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

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