Grey Downtonian

The Grey Downtonian facies occurs in the Downton Castle Sandstone Group[2] of the British Old Red Sandstone, and more or less straddles the Devonian-Silurian boundary.[3] The Ludlow Bone Bed and Temeside Shales are sometimes also included in the Grey Downtonian, which is also referred to as the Temeside group, part of the Downton Series.[4] It is intermediate between the marine flagstones beneath it and the terrestrial deposits above it.[5] The beds were deposited in a marine environment, with some material being washed in from the nearby land.[1]

Grey Downtonian
Stratigraphic range: Mid-Downtonian (Lowermost Devonian)[1]

References
  1. Allen, J. R. L.; Tarlo, L. B. (1963). "The Downtonian and Dittonian Facies of the Welsh Borderland". Geological Magazine. 100 (2): 129–155. Bibcode:1963GeoM..100..129A. doi:10.1017/S0016756800055345.
  2. Ørvig, T. O. R. (1969). "The Vertebrate Fauna of the Primaeva Beds of the Frænkelryggen Formation of Vestspitsbergen and Its Biostrati-Graphic Significance". Lethaia. 2 (3): 219–239. doi:10.1111/j.1502-3931.1969.tb01849.x.
  3. Shelford, P. H. (1961). "The Structure and Relationship of the Namurian Outcrop between Duntryleague, Co. Limerick and Dromlin, Co. Tipperary". Proceedings of the Royal Irish Academy. 62: 255–266. JSTOR 20494854.
  4. Phipps, C. B.; Reeve, F. A. E. (2007). "Stratigraphy and geological history of the Malvern, Abberley and Ledbury Hills". Geological Journal. 5 (2): 339–368. doi:10.1002/gj.3350050209.
  5. Lang, W. H. (1937). "On the Plant-Remains from the Downtonian of England and Wales". Philosophical Transactions of the Royal Society B: Biological Sciences. 227 (544): 245–291. Bibcode:1937RSPTB.227..245L. doi:10.1098/rstb.1937.0004. JSTOR 92244.
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