Zobrazeno 1 - 10 of 21 pro vyhledávání: '"Alan T. Thomas"'
1
The deep-water trilobite association of the Silurian Coldwell Siltstone Formation of northern England and its wider significance
Autor: Robert M. Owens, Alan T. Thomas, Andrew J. Storey
Publikováno v: Proceedings of the Yorkshire Geological Society. 61:1-23
The upper Wenlock Coldwell Siltstone Formation of Cumbria and North Yorkshire, which accumulated in the Lake District Basin, contains a deep-water, trilobite-dominated fauna that is documented in detail here. The trilobites of the formation are revis
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c31632dfa6c2d9e7009480d3a77ae324
https://doi.org/10.1144/pygs2015-352
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2
Sequence stratigraphy, tectonostratigraphy and basin analysis
Autor: A. J. Rees, H. E. Hughes, Alan T. Thomas, M. Lewis, P. Turner
Publikováno v: Geological Society, London, Memoirs. 42:101-134
The Dyfed Supergroup of SW Wales ranges from Terreneuvian to Furongian in age and represents a prolonged and nearly continuous phase of siliciclastic sedimentation on the southern margin of the Cambrian Welsh Basin. The lower 564 m of the Supergroup
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::db818ba28cbb579c17279854d00d8518
https://doi.org/10.1144/m42.3
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3
Lithostratigraphy and palaeoenvironments of the Cambrian in SW Wales
Autor: P. Turner, M. Lewis, H. E. Hughes, A. J. Rees, Alan T. Thomas
Publikováno v: Geological Society, London, Memoirs. 42:33-100
The classic Cambrian succession of SW Wales comprises a succession of clastic rocks some 1250 m thick that make up part of the Dyfed Supergroup. The existing lithostratigraphical framework owes much to the Nineteenth Century researchers, with relativ
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0fa20072100eb89914f01fbcf1de1622
https://doi.org/10.1144/m42.2
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4
Overview and biostratigraphy
Autor: H. E. Hughes, M. Lewis, Alan T. Thomas, P. Turner, A. J. Rees
Publikováno v: Geological Society, London, Memoirs. 42:1-31
Excellent coastal exposures of strongly folded and faulted Cambrian rocks occur around the St David's Peninsula of SW Wales. The best sections occur in the St David's Anticline, in the vicinity of St David's itself, and these have been the subject of
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ccd3645fdd79935b92c7897bb35bd4b0
https://doi.org/10.1144/m42.1
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5
Systematics, shell structure and affinities of the Palaeozoic Problematicum Cornulites
Autor: Liam G. Herringshaw, Alan T. Thomas, M. Paul Smith
The genus Cornulites, with the type species C. serpularius Schlotheim, 1820, from the Silurian of Gotland, comprises annulated, conical or tubular calcite shells, often found attached to the hard parts of other organisms. No consensus has ever been r
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d3c8c37c117dfd8c335fc1bf11d6544c
https://ora.ox.ac.uk/objects/uuid:8cf901e6-8c45-4cd6-829a-da4ed3ea1064
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6
Evolutionary and ecological significance of Lepidaster grayi, the earliest multiradiate starfish
Autor: Liam G. Herringshaw, M. Paul Smith, Alan T. Thomas
Lepidaster grayi Forbes, 1850, from the Much Wenlock Limestone Formation (Silurian: Wenlock) of England, is the earliest species of starfish (Echinodermata: Asteroidea) to deviate from pentaradial symmetry, having 13 rays rather than five. Based on t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2b204faaee9a1b964d04fa633c9aee58
https://doi.org/10.1111/j.1096-3642.2007.00299.x
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8
U-Pb (zircon) age constraints on the timing and duration of Wenlock (Silurian) paleocommunity collapse and recovery during the 'Big Crisis'
Autor: Alan T. Thomas, Daniel J. Condon, Bradley D. Cramer, Ulf Söderlund, Mikael Calner, Vincent Perrier, Ian Boomer, David C. Ray, Lennart Jeppsson, P. Jonathan Patchett, Graham Worton, Carly Marshall
Publikováno v: Geological Society of America Bulletin. 124:1841-1857
High-precision isotope-dilution U-Pb (zircon) dating was conducted on three volcanic ash fall (bentonite) samples from the Swedish island of Gotland, and on a fourth bentonite from the West Midlands, England. Zircons from the Ireviken, Grotlingbo, Dj
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d0c8546305ba61f4d0db0858113d096e
https://doi.org/10.1130/b30642.1
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9
Trilobite associations, taphonomy, lithofacies and environments of the Silurian reefs of North Greenland
Autor: Helen E. Hughes, Alan T. Thomas
Publikováno v: Palaeogeography, Palaeoclimatology, Palaeoecology. 302:142-155
Llandovery (Silurian) reefs in North Greenland have yielded extensive collections of remarkably well preserved trilobites dominated by scutelluids. These collections provide a unique opportunity to analyse the reefs and their trilobite faunas in a pa
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3efd501d70996cce64ff45971c0fe6e6
https://doi.org/10.1016/j.palaeo.2010.12.009
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10
Late Wenlock sequence stratigraphy in central England
Autor: Adrian V. J. Collings, David C. Ray, Carlton E. Brett, Alan T. Thomas
Publikováno v: Geological Magazine. 147:123-144
The late Wenlock Series (Homerian Stage) of the northern Midland Platform (central England) comprises silty mudstones and limestones of the upper part of the Coalbrookdale and overlying Much Wenlock Limestone formations. Based on outcrop studies and
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::be935f599f5b959ac0e2f9db54523280
https://doi.org/10.1017/s0016756809990197
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