Limits...
Differentiation of MIS 9 and MIS 11 in the continental record: vegetational, faunal, aminostratigraphic and sea-level evidence from coastal sites in Essex, UK.

Roe HM, Coope GR, Devoy RJ, Harrison CJ, Penkman KE, Preece RC, Schreve DC - Quat Sci Rev (2009)

Bottom Line: However, the sites can be differentiated on the basis of mammalian biostratigraphy, new aminostratigraphic data, as well as the differences in the sea-level history.The infill of a much later channel, yielding non-marine molluscs and vertebrates including Hippopotamus, appears to have formed during the Ipswichian (MIS 5e).This evidence is compared with other important sites of late Middle Pleistocene age in Britain and elsewhere on the continent and the importance of a multidisciplinary approach is stressed.

View Article: PubMed Central - PubMed

Affiliation: School of Geography, Archaeology and Palaeoecology, Queen's University of Belfast, Belfast BT7 1NN, UK.

ABSTRACT
Multidisciplinary investigations of the vegetational, faunal and sea-level history inferred from the infills of buried channels on the coast of eastern Essex have a direct bearing on the differentiation of MIS 11 and MIS 9 in continental records. New data are presented from Cudmore Grove, an important site on Mersea Island that can be linked to the terrace sequence of the River Thames. The vegetational history has been reconstructed from a pollen sequence covering much of the interglacial represented. The temperate nature of the climate is apparent from a range of fossil groups, including plant remains, vertebrates (especially the rich herpetofauna), molluscs and beetles, which all have strong thermophilous components. The beetle data have been used to derive a Mutual Climatic Range reconstruction, suggesting that mean July temperatures were about 2 degrees C warmer than modern values for southeast England, whereas mean January temperatures may have been slightly colder. The sea-level history has been reconstructed from the molluscs, ostracods and especially the diatoms, which indicate that the marine transgression occurred considerably earlier in the interglacial cycle than at the neighbouring Hoxnian site at Clacton. There are a number of palynological similarities between the sequence at Cudmore Grove and Clacton, especially the presence of Abies and the occurrence of Azolla filiculoides megaspores. Moreover, both sites have yielded Palaeolithic archaeology, indeed the latter is the type site of the Clactonian (flake-and-core) industry. However, the sites can be differentiated on the basis of mammalian biostratigraphy, new aminostratigraphic data, as well as the differences in the sea-level history. The combined evidence suggests that the infill of the channel at Cudmore Grove accumulated during MIS 9, whereas the deposits at Clacton formed during MIS 11. The infill of a much later channel, yielding non-marine molluscs and vertebrates including Hippopotamus, appears to have formed during the Ipswichian (MIS 5e). This evidence is compared with other important sites of late Middle Pleistocene age in Britain and elsewhere on the continent and the importance of a multidisciplinary approach is stressed.

No MeSH data available.


Related in: MedlinePlus

Channel margin, section A–B. The star symbol marks the position of the single struck flake found in situ in the Cudmore Grove Channel gravels (Unit 1).
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC2806946&req=5

fig5: Channel margin, section A–B. The star symbol marks the position of the single struck flake found in situ in the Cudmore Grove Channel gravels (Unit 1).

Mentions: The silty clays are truncated at the southwestern part of the site by a thin bed of shelly detritus muds, composed of abundant shell debris in a matrix of dark brown (7.5YR 2/0) silty clay. This deposit, which when sampled in the early 1990s was only a few centimetres thick, is richly fossiliferous and has yielded a wealth of faunal remains (Holman et al., 1990; see below). The detritus muds were formerly more extensive and up to 30 cm thick (Bridgland et al., 1988) but have been eroded significantly by ongoing cliff retreat. The contact between the detritus muds and the silty clays of Unit 2 is sharp and is marked by a thin bed of coarse sand. The maximum thickness of the detritus muds (15 cm) was recorded near borehole MM3 (Fig. 5). From here the unit thins rapidly westwards, grading into 2–3 cm layer of grey sand and eventually disappearing near borehole MM5.


Differentiation of MIS 9 and MIS 11 in the continental record: vegetational, faunal, aminostratigraphic and sea-level evidence from coastal sites in Essex, UK.

Roe HM, Coope GR, Devoy RJ, Harrison CJ, Penkman KE, Preece RC, Schreve DC - Quat Sci Rev (2009)

Channel margin, section A–B. The star symbol marks the position of the single struck flake found in situ in the Cudmore Grove Channel gravels (Unit 1).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2806946&req=5

fig5: Channel margin, section A–B. The star symbol marks the position of the single struck flake found in situ in the Cudmore Grove Channel gravels (Unit 1).
Mentions: The silty clays are truncated at the southwestern part of the site by a thin bed of shelly detritus muds, composed of abundant shell debris in a matrix of dark brown (7.5YR 2/0) silty clay. This deposit, which when sampled in the early 1990s was only a few centimetres thick, is richly fossiliferous and has yielded a wealth of faunal remains (Holman et al., 1990; see below). The detritus muds were formerly more extensive and up to 30 cm thick (Bridgland et al., 1988) but have been eroded significantly by ongoing cliff retreat. The contact between the detritus muds and the silty clays of Unit 2 is sharp and is marked by a thin bed of coarse sand. The maximum thickness of the detritus muds (15 cm) was recorded near borehole MM3 (Fig. 5). From here the unit thins rapidly westwards, grading into 2–3 cm layer of grey sand and eventually disappearing near borehole MM5.

Bottom Line: However, the sites can be differentiated on the basis of mammalian biostratigraphy, new aminostratigraphic data, as well as the differences in the sea-level history.The infill of a much later channel, yielding non-marine molluscs and vertebrates including Hippopotamus, appears to have formed during the Ipswichian (MIS 5e).This evidence is compared with other important sites of late Middle Pleistocene age in Britain and elsewhere on the continent and the importance of a multidisciplinary approach is stressed.

View Article: PubMed Central - PubMed

Affiliation: School of Geography, Archaeology and Palaeoecology, Queen's University of Belfast, Belfast BT7 1NN, UK.

ABSTRACT
Multidisciplinary investigations of the vegetational, faunal and sea-level history inferred from the infills of buried channels on the coast of eastern Essex have a direct bearing on the differentiation of MIS 11 and MIS 9 in continental records. New data are presented from Cudmore Grove, an important site on Mersea Island that can be linked to the terrace sequence of the River Thames. The vegetational history has been reconstructed from a pollen sequence covering much of the interglacial represented. The temperate nature of the climate is apparent from a range of fossil groups, including plant remains, vertebrates (especially the rich herpetofauna), molluscs and beetles, which all have strong thermophilous components. The beetle data have been used to derive a Mutual Climatic Range reconstruction, suggesting that mean July temperatures were about 2 degrees C warmer than modern values for southeast England, whereas mean January temperatures may have been slightly colder. The sea-level history has been reconstructed from the molluscs, ostracods and especially the diatoms, which indicate that the marine transgression occurred considerably earlier in the interglacial cycle than at the neighbouring Hoxnian site at Clacton. There are a number of palynological similarities between the sequence at Cudmore Grove and Clacton, especially the presence of Abies and the occurrence of Azolla filiculoides megaspores. Moreover, both sites have yielded Palaeolithic archaeology, indeed the latter is the type site of the Clactonian (flake-and-core) industry. However, the sites can be differentiated on the basis of mammalian biostratigraphy, new aminostratigraphic data, as well as the differences in the sea-level history. The combined evidence suggests that the infill of the channel at Cudmore Grove accumulated during MIS 9, whereas the deposits at Clacton formed during MIS 11. The infill of a much later channel, yielding non-marine molluscs and vertebrates including Hippopotamus, appears to have formed during the Ipswichian (MIS 5e). This evidence is compared with other important sites of late Middle Pleistocene age in Britain and elsewhere on the continent and the importance of a multidisciplinary approach is stressed.

No MeSH data available.


Related in: MedlinePlus