Grey Downtonian
| Grey Downtonian | |
|---|---|
| Stratigraphic range: Mid-Downtonian (Lowermost Devonian) |
The Grey Downtonian facies occurs in the Downton Castle Sandstone Group of the British Old Red Sandstone, and more or less straddles the Devonian-Silurian boundary. 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. It is intermediate between the marine flagstones beneath it and the terrestrial deposits above it. The beds were deposited in a marine environment, with some material being washed in from the nearby land.
References
- 1 2 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.
- ↑ 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. Bibcode:1969Letha...2..219O. doi:10.1111/j.1502-3931.1969.tb01849.x.
- ↑ 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.
- ↑ 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. Bibcode:1937RSPTB.227..245L. doi:10.1098/rstb.1937.0004. JSTOR 92244.
