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Rhynie chert
early Devonian sedimentary deposit exhibiting extraordinary fossil detail or completeness / From Wikipedia, the free encyclopedia
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The Rhynie chert is a Lower Devonian sedimentary rock, part of the Old Red Sandstone. It has extraordinary fossils, and is a Lagerstätte.
The chert is exposed near the village of Rhynie, Aberdeenshire, Scotland. A second unit, the Windyfield chert, is some 700 m away.
The Rhynie chert is exceptionally preserved material covered by an overlying volcanic deposit. Most of the fossil bed has primitive plants (which had water-conducting cells and sporangia, but no true leaves). There are also arthropods, lichens, algae and fungi.