|
|
Article |
The Townsend Tuff Bed has a highly distinctive internal stratigraphy which allows it to be recognized at a large number of localities scattered over the Welsh Borders and South Wales. It is a group of 3 almost directly superimposed, normally graded air-fall tuffs that originated in distant but powerful Plinian eruptions (centre unknown) and became spread over extensive, but practically featureless, coastal mud flats. The bed occurs in a barren interval within the early Lower Old Red Sandstone, between a Silurian invertebrate-vertebrate fauna below and an already Devonian vertebrate assemblage above. The base of the Devonian System in South Wales and the Welsh Borders is accordingly defined as occurring at a regionally uniform lithological contact within the Townsend Tuff Bed.
This article has been cited by other articles:
![]() |
S. Leleu, A. J. Hartley, and B. P.J. Williams Large-Scale Alluvial Architecture and Correlation in a Triassic Pebbly Braided River System, Lower Wolfville Formation (Fundy Basin, Nova Scotia, Canada) Journal of Sedimentary Research, 2009; 79: 265 - 286. [Abstract] [Full Text] [PDF] |
||||
![]() |
N.H. WOODCOCK, N.J. SOPER, and R.A. STRACHAN A Rheic cause for the Acadian deformation in Europe Journal of the Geological Society, 2007; 164: 1023 - 1036. [Abstract] [Full Text] [PDF] |
||||
![]() |
S. HILLIER, M. J. WILSON, and R. J. MERRIMAN Clay mineralogy of the Old Red Sandstone and Devonian sedimentary rocks of Wales, Scotland and England Clay Minerals, 2006; 41: 433 - 471. [Abstract] [Full Text] [PDF] |
||||
![]() |
P. F. Friend, B. P. J. Williams, M. Ford, and E. A. Williams Kinematics and dynamics of Old Red Sandstone basins Geological Society, London, Special Publications, 2000; 180: 29 - 60. [Abstract] [PDF] |
||||
![]() |
S. E. Love and B. P. J. Williams Sedimentology, cyclicity and floodplain architecture in the Lower Old Red Sandstone of SW Wales Geological Society, London, Special Publications, 2000; 180: 371 - 388. [Abstract] [PDF] |
||||
![]() |
J. D. Marshall Fault-bounded basin fill: fluvial response to tectonic controls in the Skrinkle Sandstones of SW Pembrokeshire, Wales Geological Society, London, Special Publications, 2000; 180: 401 - 416. [Abstract] [PDF] |
||||
![]() |
S. B. MARRIOTT and V. P. WRIGHT Sediment recycling on Siluro-Devonian floodplains Journal of the Geological Society, 1996; 153: 661 - 664. [Abstract] [PDF] |
||||
![]() |
S. Carroll, S. Carroll, and N. H. Trewin Cornulatichnus: a new trace fossil from the Old Red Sandstone of Orkney Scottish Journal of Geology, 1995; 31: 37 - 41. [Abstract] [PDF] |
||||
![]() |
S. B. MARRIOTT and V. P. WRIGHT Palaeosols as indicators of geomorphic stability in two Old Red Sandstone alluvial suites, South Wales Journal of the Geological Society, 1993; 150: 1109 - 1120. [Abstract] [PDF] |
||||
![]() |
B. J. Bluck, J. C. W. Cope, and C. T. Scrutton Devonian Geological Society, London, Memoirs, 1992; 13: 57 - 66. [Abstract] [PDF] |
||||
![]() |
M. G. Bassett, B. J. Bluck, R. Cave, C. H. Holland, and J. D. Lawson Silurian Geological Society, London, Memoirs, 1992; 13: 17 - 56. [Abstract] [PDF] |
||||
![]() |
M. J. O'SULLIVAN, M. A. COOPER, I. A. J. MACCARTHY, and W. H. FORBES The palaeoenvironment and deformation of Beaconites-like burrows in the Old Red Sandstone at Gortnabinna, SW Ireland Journal of the Geological Society, 1986; 143: 897 - 906. [Abstract] [PDF] |
||||
![]() |
G. C. Brown, E. H. Francis, P. Kennan, and C. J. Stillman Caledonian igneous rocks of Britain and Ireland Geological Society, London, Memoirs, 1985; 9: 1 - 15. [Abstract] [PDF] |
||||
![]() |
R. J. Suthren Facies analysis of volcaniclastic sediments: a review Geological Society, London, Special Publications, 1985; 18: 123 - 146. [Abstract] [PDF] |
||||
![]() |
A. Parker, J. R. L. Allen, and B. P. J. Williams Clay mineral assemblages of the Townsend Tuff Bed (Lower Old Red Sandstone), South Wales and the Welsh Borders Journal of the Geological Society, 1983; 140: 769 - 779. [Abstract] [PDF] |
||||
![]() |
W. M. Dunne Tectonic evolution of SW Wales during the Upper Palaeozoic Journal of the Geological Society, 1983; 140: 257 - 265. [Abstract] [PDF] |
||||