Allen, J. R L., Turner, R. and Rippon, S. J. (2000). Sea Level, Salt Marsh and Fen, Shaping the Severn Estuary Levels in the Later Quaternary Ipswichian Holocene. Archaeology in the Severn Estuary 11. Vol 11, pp. 1-12. https://doi.org/10.5284/1069471. Cite this via datacite
 Title The title of the publication or report |
Sea Level, Salt Marsh and Fen, Shaping the Severn Estuary Levels in the Later Quaternary Ipswichian Holocene | ||
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Subtitle The sub title of the publication or report |
ten years past and ten years forward | ||
Issue The name of the volume or issue |
Archaeology in the Severn Estuary 11 | ||
Series The series the publication or report is included in |
Archaeology in the Severn Estuary | ||
Volume Volume number and part |
11 | ||
Page Start/End The start and end page numbers. |
1 - 12 | ||
Downloads Any files associated with the publication or report that can be downloaded from the ADS |
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Licence Type ADS, CC-BY 4.0 or CC-BY 4.0 NC. |
ADS Terms of Use and Access
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DOI The DOI (digital object identifier) for the publication or report. |
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Publication Type The type of publication - report, monograph, journal article or chapter from a book |
Journal | ||
Abstract The abstract describing the content of the publication or report |
The Holocene sediments (c.8 km3) in the Severn Estuary Levels (c.840 km2) rest on a rockhead platform that was dissected by streams prior to the lpswichian (last interglacial) high-stand of the sea (c.6 m OD). lpswichianfluvial gravels plug these valleys and grade up into shelly, littoral deposits which also lie buried in places along the inner margin of the Holocene outcrop. The Devensian cold period saw widespread periglacial conditions, with ice entering the levels in the Carmarthen Bay, Swansea Bay and Cardijj Bay areas during the glacial maximum (19-23 ka ea! BP) Sea level rose unevenly during the Holocene which followed, significant fluctuations being superimposed on the underlying upward trend, which was at first ve,y rapid. The uneven rise created on the margins of the Severn Estuary a Holocene sequence, typically 10-15 m thick, of transgressive estuarine silts (salt marshes with creek networks, some mudflats) which alternate with regressive, high intertidal-terrestrial peats (chiefly reed swamp,fen carr, woodland, raised bog). These peats are very variable in development, both regionally and locally, but in response to environmental factors tend to become thicker with increasing distance from the sea and the rivers that cross the levels. Continuous sediment compaction strongly influenced the character of the local succession and ensured, together with the configuration of the underlying bedrock surface, that quasi-isochronous lithological contacts within the sequence now have a relief of up to several metres. The continuing rise of sea level, coupled with an increase in tidal range, is driving the estuary as a whole northeastward up the Severn Vale, together with the Holocene sequence on its margins. | ||
Year of Publication The year the book, article or report was published |
2000 | ||
Source Where the record has come from or which dataset it was orginally included in. |
ADS Archive
(ADS Archive)
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Relations Other resources which are relevant to this publication or report |
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Created Date The date the record of the pubication was first entered |
09 Oct 2017 |
