Rhynie chert

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What Wikipedia says

The Rhynie chert is a Lower Devonian sedimentary deposit exhibiting extraordinary fossil detail or completeness (a Lagerstätte). It is exposed near the village of Rhynie, Aberdeenshire, Scotland; a second unit, the Windyfield chert, is located some 700 m away.

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

Image: Jpwilson at English Wikipedia, Public domain, via Wikimedia Commons.