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New evidence for complex climate change in MIS 11 from Hoxne, Suffolk, UK.

Ashton N, Lewis SG, Parfitt SA, Penkman KE, Russell Coope G - Quat Sci Rev (2008)

Bottom Line: The later temperate phase was deposited during an episode of boreal woodland and is associated with the artefacts, a diverse vertebrate fauna and molluscs.New amino acid geochronological data and biostratigraphical considerations suggest that the post-Hoxnian sequence correlates with late substages of MIS 11.The paper further investigates the correlation of the sequence at Hoxne with the palynological sequences found elsewhere in Europe and adjacent offshore areas.

View Article: PubMed Central - PubMed

Affiliation: Department of Prehistory and Europe, British Museum, Franks House, 56 Orsman Road, London N1 5QJ, UK.

ABSTRACT
The climatic signal of Marine Isotope Stage (MIS) 11 is well-documented in marine and ice-sheet isotopic records and is known to comprise at least two major warm episodes with an intervening cool phase. Terrestrial records of MIS 11, though of high resolution, are often fragmentary and their chronology is poorly constrained. However, some notable exceptions include sequences from the maar lakes in France and Tenaghi Philippon in Greece. In the UK, the Hoxnian Interglacial has been considered to correlate with MIS 11. New investigations at Hoxne (Suffolk) provide an opportunity to re-evaluate the terrestrial record of MIS 11. At Hoxne, the type Hoxnian Interglacial sediments are overlain by a post-Hoxnian cold-temperate sequence. The interglacial sediments and the later temperate phase are separated by the so-called 'Arctic Bed' from which cold-climate macroscopic plant and beetle remains have been recovered. The later temperate phase was deposited during an episode of boreal woodland and is associated with the artefacts, a diverse vertebrate fauna and molluscs. New amino acid geochronological data and biostratigraphical considerations suggest that the post-Hoxnian sequence correlates with late substages of MIS 11. The paper further investigates the correlation of the sequence at Hoxne with the palynological sequences found elsewhere in Europe and adjacent offshore areas.

No MeSH data available.


Related in: MedlinePlus

D/L values of Asx, Glx, Ala, Val and [Ser]/[Ala] for the (A) Free(FAA;F) and (B) Total Hydrolysable amino acid (THAA;H) fractions of bleachedBithynia tentaculata opercula from Hoxne (Strata Eand B2), compared with shells from sites correlated with MIS 9 (Cudmore Grove,Grays, Hackney, Purfleet) and sites correlated with MIS 11 (Elveden, EbbsfleetSouthfleet Road, Swanscombe, Woodston, Clacton, Beeches Pit). For each group,the base of the box indicates the 25th percentile. Within the box, the solidline plots the median and the dashed line shows the mean. The top of the boxindicates the 75th percentile. Where more than nine data points are available,the 10th and 90th percentiles can be calculated (shown by lines at the bottomand the top of the boxes, respectively). The results of each duplicate analysisare included in order to provide a statistically significant sample size. They-axes for the [Ser]/[Ala] data are plotted in reverse, so that the direction ofincreased protein degradation for each of the indicators remains the same. Note:different scales on the y-axes.
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fig7: D/L values of Asx, Glx, Ala, Val and [Ser]/[Ala] for the (A) Free(FAA;F) and (B) Total Hydrolysable amino acid (THAA;H) fractions of bleachedBithynia tentaculata opercula from Hoxne (Strata Eand B2), compared with shells from sites correlated with MIS 9 (Cudmore Grove,Grays, Hackney, Purfleet) and sites correlated with MIS 11 (Elveden, EbbsfleetSouthfleet Road, Swanscombe, Woodston, Clacton, Beeches Pit). For each group,the base of the box indicates the 25th percentile. Within the box, the solidline plots the median and the dashed line shows the mean. The top of the boxindicates the 75th percentile. Where more than nine data points are available,the 10th and 90th percentiles can be calculated (shown by lines at the bottomand the top of the boxes, respectively). The results of each duplicate analysisare included in order to provide a statistically significant sample size. They-axes for the [Ser]/[Ala] data are plotted in reverse, so that the direction ofincreased protein degradation for each of the indicators remains the same. Note:different scales on the y-axes.

Mentions: The samples were from Stratum E (NEaar 0498–0500, 2446–2447)and Stratum B2 (NEaar 3143–3150). The results show levels of proteindecomposition higher than those from sites correlated with MIS 9, but lower thanthose from sites of pre-Anglian age (Fig.7; Table 3). Furthermore, thelevels of protein decomposition are similar to those from sites correlated withMIS 11, including Elveden (Ashton et al.,2005), Beeches Pit (Preece etal., 2007), Barnham (Preece andPenkman, 2005), Clacton (Penkmanet al., in press), Woodston and Swanscombe (Penkman, 2005). This indicates an age for Hoxnebetween the Anglian (MIS 12) and early MIS 9. The opercula samples from StratumE tend to have slightly greater protein decomposition than those from Stratum B2and less degraded protein than found in opercula from the Lower Freshwater Bedat Clacton, which was deposited early in MIS 11 (Bridgland et al., 1999).


New evidence for complex climate change in MIS 11 from Hoxne, Suffolk, UK.

Ashton N, Lewis SG, Parfitt SA, Penkman KE, Russell Coope G - Quat Sci Rev (2008)

D/L values of Asx, Glx, Ala, Val and [Ser]/[Ala] for the (A) Free(FAA;F) and (B) Total Hydrolysable amino acid (THAA;H) fractions of bleachedBithynia tentaculata opercula from Hoxne (Strata Eand B2), compared with shells from sites correlated with MIS 9 (Cudmore Grove,Grays, Hackney, Purfleet) and sites correlated with MIS 11 (Elveden, EbbsfleetSouthfleet Road, Swanscombe, Woodston, Clacton, Beeches Pit). For each group,the base of the box indicates the 25th percentile. Within the box, the solidline plots the median and the dashed line shows the mean. The top of the boxindicates the 75th percentile. Where more than nine data points are available,the 10th and 90th percentiles can be calculated (shown by lines at the bottomand the top of the boxes, respectively). The results of each duplicate analysisare included in order to provide a statistically significant sample size. They-axes for the [Ser]/[Ala] data are plotted in reverse, so that the direction ofincreased protein degradation for each of the indicators remains the same. Note:different scales on the y-axes.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC2748712&req=5

fig7: D/L values of Asx, Glx, Ala, Val and [Ser]/[Ala] for the (A) Free(FAA;F) and (B) Total Hydrolysable amino acid (THAA;H) fractions of bleachedBithynia tentaculata opercula from Hoxne (Strata Eand B2), compared with shells from sites correlated with MIS 9 (Cudmore Grove,Grays, Hackney, Purfleet) and sites correlated with MIS 11 (Elveden, EbbsfleetSouthfleet Road, Swanscombe, Woodston, Clacton, Beeches Pit). For each group,the base of the box indicates the 25th percentile. Within the box, the solidline plots the median and the dashed line shows the mean. The top of the boxindicates the 75th percentile. Where more than nine data points are available,the 10th and 90th percentiles can be calculated (shown by lines at the bottomand the top of the boxes, respectively). The results of each duplicate analysisare included in order to provide a statistically significant sample size. They-axes for the [Ser]/[Ala] data are plotted in reverse, so that the direction ofincreased protein degradation for each of the indicators remains the same. Note:different scales on the y-axes.
Mentions: The samples were from Stratum E (NEaar 0498–0500, 2446–2447)and Stratum B2 (NEaar 3143–3150). The results show levels of proteindecomposition higher than those from sites correlated with MIS 9, but lower thanthose from sites of pre-Anglian age (Fig.7; Table 3). Furthermore, thelevels of protein decomposition are similar to those from sites correlated withMIS 11, including Elveden (Ashton et al.,2005), Beeches Pit (Preece etal., 2007), Barnham (Preece andPenkman, 2005), Clacton (Penkmanet al., in press), Woodston and Swanscombe (Penkman, 2005). This indicates an age for Hoxnebetween the Anglian (MIS 12) and early MIS 9. The opercula samples from StratumE tend to have slightly greater protein decomposition than those from Stratum B2and less degraded protein than found in opercula from the Lower Freshwater Bedat Clacton, which was deposited early in MIS 11 (Bridgland et al., 1999).

Bottom Line: The later temperate phase was deposited during an episode of boreal woodland and is associated with the artefacts, a diverse vertebrate fauna and molluscs.New amino acid geochronological data and biostratigraphical considerations suggest that the post-Hoxnian sequence correlates with late substages of MIS 11.The paper further investigates the correlation of the sequence at Hoxne with the palynological sequences found elsewhere in Europe and adjacent offshore areas.

View Article: PubMed Central - PubMed

Affiliation: Department of Prehistory and Europe, British Museum, Franks House, 56 Orsman Road, London N1 5QJ, UK.

ABSTRACT
The climatic signal of Marine Isotope Stage (MIS) 11 is well-documented in marine and ice-sheet isotopic records and is known to comprise at least two major warm episodes with an intervening cool phase. Terrestrial records of MIS 11, though of high resolution, are often fragmentary and their chronology is poorly constrained. However, some notable exceptions include sequences from the maar lakes in France and Tenaghi Philippon in Greece. In the UK, the Hoxnian Interglacial has been considered to correlate with MIS 11. New investigations at Hoxne (Suffolk) provide an opportunity to re-evaluate the terrestrial record of MIS 11. At Hoxne, the type Hoxnian Interglacial sediments are overlain by a post-Hoxnian cold-temperate sequence. The interglacial sediments and the later temperate phase are separated by the so-called 'Arctic Bed' from which cold-climate macroscopic plant and beetle remains have been recovered. The later temperate phase was deposited during an episode of boreal woodland and is associated with the artefacts, a diverse vertebrate fauna and molluscs. New amino acid geochronological data and biostratigraphical considerations suggest that the post-Hoxnian sequence correlates with late substages of MIS 11. The paper further investigates the correlation of the sequence at Hoxne with the palynological sequences found elsewhere in Europe and adjacent offshore areas.

No MeSH data available.


Related in: MedlinePlus