Earth:Grey Downtonian
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| Grey Downtonian Stratigraphic range: Mid-Downtonian (Lowermost Devonian)[1] |
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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]
References
- ↑ 1.0 1.1 Allen, J. R. L.; Tarlo, L. B. (1963). "The Downtonian and Dittonian Facies of the Welsh Borderland". Geological Magazine 100 (2): 129–155. doi:10.1017/S0016756800055345. Bibcode: 1963GeoM..100..129A.
- ↑ 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. Bibcode: 1969Letha...2..219O.
- ↑ 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.
- ↑ 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.
- ↑ 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. doi:10.1098/rstb.1937.0004. Bibcode: 1937RSPTB.227..245L.
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