Gray Sandstone Group
Geological group in west Wales
Gray Sandstone Group | |
---|---|
Stratigraphic range: Wenlockian (Silurian) | |
Thick sandstone units of the Gray Sandstone Group outcropping on the coast, just west of Marloes Sands | |
Type | Group |
Underlies | Red Marls Formation |
Overlies | Coralliferous Group |
Thickness | circa 274 - 609m |
Lithology | |
Primary | quartzitic sandstones |
Other | mudstones |
Location | |
Country | Wales |
Extent | south Pembrokeshire |
The Gray Sandstone Group is a late Silurian lithostratigraphic group (a sequence of rock strata) in west Wales. The strata are exposed in the coast around the Milford Haven area; outcrops occur either side of Marloes Bay. Besides quartzitic sandstones and mudstones, sandy rottenstones are found at outcrop. Fossils within the rottenstone beds include brachiopods and corals.[1] The rocks of this group have also previously been known as the Gray Sandstone Series.[2]