Gray Sandstone Group
Appearance
Gray Sandstone Group | |
---|---|
Stratigraphic range: Wenlockian (Silurian) | |
![]() Thick sandstone units of the Gray Sandstone Group outcropping on the coast, just west of Marloes Sands | |
Typ | Group |
Underlies | Red Marls Formation |
Overlies | Coralliferous Group |
Thickness | circa 274 - 609m |
Lithology | |
Primäre | quartzitic sandstones |
Other | mudstones |
Standort | |
Land | 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]
References
[edit]- ^ Howells, M.F. 2007 British Regional Geology: Wales (Keyworth, Nottingham. British Geological Survey) pp86, 89-90
- ^ http://www.bgs.ac.uk/Lexicon/lexicon.cfm?pub=GSA (BGS on-line lexicon of rock units)