| 词条 | Grey Downtonian |
| 释义 |
| period = Lower Devonian | age = Mid-Downtonian (Lowermost Devonian)[1] }} 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] References1. ^1 {{Cite journal | last1 = Allen | first1 = J. R. L. | last2 = Tarlo | first2 = L. B. | doi = 10.1017/S0016756800055345 | title = The Downtonian and Dittonian Facies of the Welsh Borderland | journal = Geological Magazine | volume = 100 | issue = 2 | pages = 129 -155| year = 1963| pmid = | pmc = }} 2. ^{{Cite journal | last1 = Ørvig | first1 = T. O. R. | title = The Vertebrate Fauna of the Primaeva Beds of the Frænkelryggen Formation of Vestspitsbergen and Its Biostrati-Graphic Significance | journal = Lethaia | volume = 2 | pages = 219 | year = 1969 | doi = 10.1111/j.1502-3931.1969.tb01849.x }} 3. ^{{Cite journal | jstor = 20494854 | last1 = Shelford | first1 = P. H. | title = The Structure and Relationship of the Namurian Outcrop between Duntryleague, Co. Limerick and Dromlin, Co. Tipperary | journal = Proceedings of the Royal Irish Academy | volume = 62 | pages = 255–266 | year = 1961 | doi=10.2307/20494854}} 4. ^{{Cite journal | last1 = Phipps | first1 = C. B. | last2 = Reeve | first2 = F. A. E. | title = Stratigraphy and geological history of the Malvern, Abberley and Ledbury Hills | journal = Geological Journal | volume = 5 | pages = 339 | year = 2007 | doi = 10.1002/gj.3350050209 }} 5. ^{{Cite journal | doi = 10.1098/rstb.1937.0004 | jstor = 92244 | last1 = Lang | first1 = W. H. | title = On the Plant-Remains from the Downtonian of England and Wales | journal = Philosophical Transactions of the Royal Society B: Biological Sciences | volume = 227 | issue = 544 | pages = 245–291 | year = 1937 |bibcode = 1937RSPTB.227..245L }} 9 : Sandstone formations|Carboniferous United Kingdom|Devonian United Kingdom|Silurian United Kingdom|Geologic formations with imbedded sand dunes|Geologic formations of the United Kingdom|Silurian paleontological sites|Devonian paleontological sites|Carboniferous paleontological sites |
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