The Redhill Mudstone, often referred to as the Slade and Redhill Mudstone Formation, is a geologic formation in Wales. It preserves fossils dating back to the Ordovician period (around 450 to 446 million years ago). It’s mostly composed of thin sandstones and mudstones of a blue-gray color. This formation is most notable for its preservation of near-perfect marine fossils.
See also
List of fossiliferous stratigraphic units in Wales
References