The Late‐glacial and Early Flandrian Deposits at Traeth Mawr, Brecon Beacons, South Wales

Walker, Mike

doi:10.1111/j.1469-8137.1982.tb03250.x

Cited by 39 publications

(23 citation statements)

References 44 publications

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“…This takes the form of a double peak, with the earlier peak reaching the highest frequencies. A climatic oscillation within the Betula phase has also been recorded, along with an earlier smaller second oscillation, at other sites across the UK including Gransmoor in NE England (Mayle et al 1999;Walker et al 1993), Traeth Mawr (Walker 1982) and Borrobol (Mayle et al 1999), and is dated between 13 000 and 12 800 GRIP year BP at Hawes Water (Jones et al 2002).…”

Section: Environmental Inferencesmentioning

confidence: 97%

Palaeoenvironmental context of the Late‐glacial woolly mammoth (Mammuthus primigenius) discoveries at Condover, Shropshire, UK

et al. 2009

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In 1986/1987 the remains of several mammoths, Mammuthus primigenius (Blumenbach), were discovered on the spoil heap of an actively working gravel pit at Condover, Shropshire, England. The discovery of the remains posed two questions that could be addressed by analyses of biological proxies. First, as none of the bones was found in situ it was necessary to confirm the stratum in which the remains occurred. Second, what was the environment in which these animals lived and died? A range of biological indicators was used to address these questions, including pollen, spore and algal, plant macrofossil, invertebrate, anuran and biological mineral analyses. Multivariate statistical analyses of palynological and Pediastrum data, along with evidence from the Coleopteran assemblages, support the attribution of the mammoth bones to a unit of dark grey clayey sandy silt, although they may have lived at the time of the overlying green detritus mud. The palaeobiological data supports the correlation of these sediments to the Devensian Late‐glacial. The mammoths entered this basin at the start of the Late‐glacial Interstadial (Greenland Interstadial 1e) (ca. 14 830—3930 cal. year BP; 12 300 ± 110 14C year BP) and became mired in soft cohesive sediments. Palaeotemperature reconstructions, based on the Coleopteran assemblages, from the time when the mammoths actually became mired, show that the climate was temperate with mean July temperatures between 15 and 19°C and mean January temperatures between −13 and +6°C. Biological indicators from the sediments encasing the mammoths indicate that the landscape surrounding the basin was treeless and dry, contrasting with rich vegetation within the basin itself that had possibly attracted the mammoths to the site. Evidence of sedimentary disturbance suggests that the mammoths caused large‐scale bioturbation of the deposits making palaeoenvironmental interpretations difficult. Fossils of terrestrial blowflies, carcass and dung beetles show that some of the decaying corpses must have lain exposed on the land surface for sufficient time for the soft parts to have rotted away and skin and bones to have become desiccated before many of them sank into the dark grey clayey sandy silt. Copyright © 2009 John Wiley & Sons, Ltd.

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Section: Environmental Inferencesmentioning

confidence: 97%

Palaeoenvironmental context of the Late‐glacial woolly mammoth (Mammuthus primigenius) discoveries at Condover, Shropshire, UK

et al. 2009

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“…Gransmoor: Walker et al, 1993;Mayle et al, 1999), Wales (e.g. Traeth Mawr: Walker, 1982;Llanilid: Walker and Harkness, 1990;Mayle et al, 1999), Scotland (Borrobol: Mayle et al, 1999;Whitrig Bog: Mayle et al, 1997Lundin Tower: Whittington et al, 1996) and Ireland (e.g. Red Bog: Ahlberg et al, 1996), where a diverse range of biological and geochemical evidence highlights two brief periods of deteriorating climatic conditions.…”

Section: General Climatic Trendsmentioning

confidence: 99%

A high resolution, multiproxy Late‐glacial record of climate change and intrasystem responses in northwest England

Jones

Marshall

Crowley

et al. 2002

J Quaternary Science

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A lacustrine carbonate sequence from Hawes Water, Lancashire, UK, has been studied using stable isotopic, lithological, pollen and mineral magnetic analysis. The data reveal four abrupt climatic oscillations in the Late-glacial Interstadial leading up to the onset of the Loch Lomond Stadial. The data also point to climatic warming relatively early within the stadial, ca. 12 500 GRIP yr, prior to the onset of the Holocene. The oxygen isotope record is taken as a signature of climate forcing against which the response of the lake-system can be monitored. By adopting this approach it is revealed that the response of the biological system to the rapid climatic oscillations is nonlinear and primarily a function of the antecedent conditions. A significant end-Devensian isotopic excursion (A) is matched by only minor changes in the cold-adapted floras and faunas. During the warmer interstadial, the response of the biological ecosystem (events B-D) is clearly influenced by thresholds: major changes in the catchment vegetation associated with relatively minor oscillations in the isotopic signature. The stratigraphical patterns reveal significant lag effects between the onset of climate deterioration and resulting changes in vegetation.

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“…1) indicate that this renewed glacier development occurred during the Loch Lomond Stadial ofthe Late-glacial period (Walker, 1980), approximately equivalent in time with the Younger Dryas of Scandinavia (Sissons, 1979;Lowe and Gray, 1980). The basin which is downvalley from the moraines contains a full sequence of Late-glacial sediments, the details of which have been considered elsewhere (Walker, 1982). This paper discusses the biostratigraphy at the two sites within the moraines of Craig-y-Fro and Craig Cerrig-gleisiad where only Flandrian sediments are found, and describes landscape changes in this part of the Brecon Beacons from the disappearance of the Loch Lomond Advance glaciers to the establishment of Quercus and Alnus woodland some 4000 to 5000 years later.…”

Section: Introductionmentioning

confidence: 99%

Early‐and Mid‐flandrian Environmental History of the Brecon Beacons, South Wales

Walker

1982

New Phytologist

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SUMMARY Pollen‐stratigraphic data are described from two sites on the northern face of the Brecon Beacons escarpment in South Wales, U.K. Pollen percentage, pollen concentration and deteriorated pollen diagrams are presented which contain details of vegetational changes in this part of Britain from the time period immediately following the wastage of the Loch Lomond Advance glaciers around 10000 radiocarbon years ago, until the establishment of oak and alder woodland in the mid‐ Flandrian some 4000 years later. An initial phase of juniper scrub was followed by the expansion of birch woodland over much of the area, and these forests were subsequently invaded by large numbers of hazel. Quercus, Ulmus and Pinus were present throughout the mid‐Flandrian, but increasing climatic wetness, possibly beginning around 7000 radiocarbon years ago, led to the decline of elm, pine and birch as woodland components in this part of South Wales, and to the expansion of Quercus and particularly Alnus. These vegetational changes are discussed in terms of vegetational developments at other sites in upland Wales and western Britain.

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The Late‐glacial and Early Flandrian Deposits at Traeth Mawr, Brecon Beacons, South Wales

Cited by 39 publications

References 44 publications

Palaeoenvironmental context of the Late‐glacial woolly mammoth (Mammuthus primigenius) discoveries at Condover, Shropshire, UK

Palaeoenvironmental context of the Late‐glacial woolly mammoth (Mammuthus primigenius) discoveries at Condover, Shropshire, UK

A high resolution, multiproxy Late‐glacial record of climate change and intrasystem responses in northwest England

Early‐and Mid‐flandrian Environmental History of the Brecon Beacons, South Wales

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