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57°20′12″N 002°50′29″W / 57.33667°N 2.84139°W
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.