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Catchment inversion during the Silurian of SW Wales: Pediment plains, embryonic drainage networks and incised valley fills in a dryland range front alluvial system

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Catchment inversion during the Silurian of SW Wales : Pediment plains, embryonic drainage networks and incised valley fills in a dryland range front alluvial system. / Hillier, Robert D.; Marriott, Susan B.; Higgs, Ken T.; Howells, Sid.

In: Sedimentary Geology, Vol. 387, 01.06.2019, p. 126-151.

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Hillier, Robert D. ; Marriott, Susan B. ; Higgs, Ken T. ; Howells, Sid. / Catchment inversion during the Silurian of SW Wales : Pediment plains, embryonic drainage networks and incised valley fills in a dryland range front alluvial system. In: Sedimentary Geology. 2019 ; Vol. 387. pp. 126-151.

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@article{d300efd04cb1490cb5112314bebc2b6f,
title = "Catchment inversion during the Silurian of SW Wales: Pediment plains, embryonic drainage networks and incised valley fills in a dryland range front alluvial system",
abstract = "Ludlow to Př{\'i}dol{\'i} age Old Red Sandstone alluvial to marginal marine deposits of the Anglo-Welsh Basin record a punctuated molasse shed from an inverted, transient catchment area. An erosional low-gradient sequence-bounding pediment surface was created basinward of a structurally controlled, transpressive piedmont junction. A thin mantle of debris flow dominated colluvium comprising the Abercyfor Formation was deposited proximal to a lowstand delta shoreline 90 km to the east and south. Temeside Mudstone Formation coastal plain deposits developed behind the delta passing westward into range front, dryland red bed alluvium of the Moor Cliffs Formation. This embryonic mudstone-dominated alluvial plain aggraded during an interval of enhanced accommodation space development. Muds were liberated from their Lower Palaeozoic bedrock provenance within and to the north of the piedmont junction. Dryland alluvial sandstone channels possibly represent stream capture events associated with hinterland drainage reorganisation. The latter promoted continued headward erosion and enlargement of the catchment area. Basinwide incision (to a depth of approximately 60 m)of the alluvial plain occurred in the mid Př{\'i}dol{\'i}, with valley locations being structurally controlled. Subsequent fills preserve the middle reaches of a simple incised valley system. Lowstand to early transgressive streamflow conglomerates of the Freshwater East Formation were deposited, with sediment transport to the SE. Valley drainage was defeated by neotectonic uplift of the Orielton Anticlinorium in downstream valley reaches leading to drainage reorganisation. Accommodation space was developed at structural tip points where maximum rates of marine transgression ensued preserving backstepping parasequences of a wave dominated estuary. Localised debritic alluvial fans were shed below the interval of maximum flooding. Continued dryland sedimentation led to highstand filling and subsequent basinwide alluvial regression which continued into the late Př{\'i}dol{\'i}.",
keywords = "Alluvial, Dryland, Incised valley fill, Old Red Sandstone, Pediment, Silurian",
author = "Hillier, {Robert D.} and Marriott, {Susan B.} and Higgs, {Ken T.} and Sid Howells",
year = "2019",
month = "6",
day = "1",
doi = "10.1016/j.sedgeo.2019.04.007",
language = "English",
volume = "387",
pages = "126--151",
journal = "Sedimentary Geology",
issn = "0037-0738",
publisher = "Elsevier",

}

RIS - suitable for import to EndNote

TY - JOUR

T1 - Catchment inversion during the Silurian of SW Wales

T2 - Pediment plains, embryonic drainage networks and incised valley fills in a dryland range front alluvial system

AU - Hillier, Robert D.

AU - Marriott, Susan B.

AU - Higgs, Ken T.

AU - Howells, Sid

PY - 2019/6/1

Y1 - 2019/6/1

N2 - Ludlow to Přídolí age Old Red Sandstone alluvial to marginal marine deposits of the Anglo-Welsh Basin record a punctuated molasse shed from an inverted, transient catchment area. An erosional low-gradient sequence-bounding pediment surface was created basinward of a structurally controlled, transpressive piedmont junction. A thin mantle of debris flow dominated colluvium comprising the Abercyfor Formation was deposited proximal to a lowstand delta shoreline 90 km to the east and south. Temeside Mudstone Formation coastal plain deposits developed behind the delta passing westward into range front, dryland red bed alluvium of the Moor Cliffs Formation. This embryonic mudstone-dominated alluvial plain aggraded during an interval of enhanced accommodation space development. Muds were liberated from their Lower Palaeozoic bedrock provenance within and to the north of the piedmont junction. Dryland alluvial sandstone channels possibly represent stream capture events associated with hinterland drainage reorganisation. The latter promoted continued headward erosion and enlargement of the catchment area. Basinwide incision (to a depth of approximately 60 m)of the alluvial plain occurred in the mid Přídolí, with valley locations being structurally controlled. Subsequent fills preserve the middle reaches of a simple incised valley system. Lowstand to early transgressive streamflow conglomerates of the Freshwater East Formation were deposited, with sediment transport to the SE. Valley drainage was defeated by neotectonic uplift of the Orielton Anticlinorium in downstream valley reaches leading to drainage reorganisation. Accommodation space was developed at structural tip points where maximum rates of marine transgression ensued preserving backstepping parasequences of a wave dominated estuary. Localised debritic alluvial fans were shed below the interval of maximum flooding. Continued dryland sedimentation led to highstand filling and subsequent basinwide alluvial regression which continued into the late Přídolí.

AB - Ludlow to Přídolí age Old Red Sandstone alluvial to marginal marine deposits of the Anglo-Welsh Basin record a punctuated molasse shed from an inverted, transient catchment area. An erosional low-gradient sequence-bounding pediment surface was created basinward of a structurally controlled, transpressive piedmont junction. A thin mantle of debris flow dominated colluvium comprising the Abercyfor Formation was deposited proximal to a lowstand delta shoreline 90 km to the east and south. Temeside Mudstone Formation coastal plain deposits developed behind the delta passing westward into range front, dryland red bed alluvium of the Moor Cliffs Formation. This embryonic mudstone-dominated alluvial plain aggraded during an interval of enhanced accommodation space development. Muds were liberated from their Lower Palaeozoic bedrock provenance within and to the north of the piedmont junction. Dryland alluvial sandstone channels possibly represent stream capture events associated with hinterland drainage reorganisation. The latter promoted continued headward erosion and enlargement of the catchment area. Basinwide incision (to a depth of approximately 60 m)of the alluvial plain occurred in the mid Přídolí, with valley locations being structurally controlled. Subsequent fills preserve the middle reaches of a simple incised valley system. Lowstand to early transgressive streamflow conglomerates of the Freshwater East Formation were deposited, with sediment transport to the SE. Valley drainage was defeated by neotectonic uplift of the Orielton Anticlinorium in downstream valley reaches leading to drainage reorganisation. Accommodation space was developed at structural tip points where maximum rates of marine transgression ensued preserving backstepping parasequences of a wave dominated estuary. Localised debritic alluvial fans were shed below the interval of maximum flooding. Continued dryland sedimentation led to highstand filling and subsequent basinwide alluvial regression which continued into the late Přídolí.

KW - Alluvial

KW - Dryland

KW - Incised valley fill

KW - Old Red Sandstone

KW - Pediment

KW - Silurian

UR - http://www.scopus.com/inward/record.url?scp=85065519950&partnerID=8YFLogxK

U2 - 10.1016/j.sedgeo.2019.04.007

DO - 10.1016/j.sedgeo.2019.04.007

M3 - Article

VL - 387

SP - 126

EP - 151

JO - Sedimentary Geology

JF - Sedimentary Geology

SN - 0037-0738

ER -