The Devensian periglacial record on Thanet, Kent, UK

J.B. Murton, M.D. Bateman, C.A. Baker, R. Knox, C.A. Whiteman

Research output: Contribution to journalArticle

Abstract

The Devensian periglacial record on Thanet, Kent, is traced from c. 88 to 74 ka and from c. 24 to 12 ka by optical luminescence dating of aeolian sand and silt in the periglacial stratigraphy. The record commences before 88 ka with valley cutting at Pegwell Bay. Valley filling had begun by c. 88 ka and continued to at least 74 ka, coinciding with a major episode of loess deposition in Europe. Permafrost aggradation commenced before c. 21 ka, brecciating near-surface chalk by ice segregation in permafrost and the overlying active layer. Deposition of aeolian sand (coversand) occurred at c. 24 21 ka, correlating with the Older Coversand I in mainland Europe. Permafrost degradation commenced at c. 21 ka, probably due to climate warming during Greenland Interstadial 2. The resulting active-layer deepening through ice-rich permafrost initiated soft-sediment deformation and formation of large-scale patterned ground in an active layer c. 2m deep. Renewed permafrost aggradation between c. 21.25 and 18 ka coincided with climate cooling during Greenland Stadial 2c and led to cryoturbation in a thinner active layer. Final permafrost degradation commenced no later than c. 14.7 ka, that is, the start of Greenland Interstadial 1e, and may have occurred to some extent during the climate warming associated with Greenland Stadial 2b (c. 19.5 16.9 ka). Renewed deposition of aeolian sand took place at c. 15.5 ka, coincident with loess deposition on Thanet. A final episode of aeolian sand deposition occurred at 12 ka, correlating with the Younger Coversand deposits that are widespread in northwest Europe and formed during Greenland Stadial 1.
Original languageEnglish
Pages (from-to)217-246
Number of pages30
JournalPermafrost and Periglacial Processes
Volume14
Issue number3
Publication statusPublished - Aug 2003

Fingerprint

Devensian
permafrost
active layer
sand
interstadial
aggradation
loess
climate
warming
cryoturbation
patterned ground
ice
valley
luminescence dating
chalk
silt
stratigraphy
cooling
sediment
Europe

Keywords

  • permafrost
  • active layer
  • aeolian activity
  • luminescence dating
  • Devensian

Cite this

Murton, J. B., Bateman, M. D., Baker, C. A., Knox, R., & Whiteman, C. A. (2003). The Devensian periglacial record on Thanet, Kent, UK. Permafrost and Periglacial Processes, 14(3), 217-246.
Murton, J.B. ; Bateman, M.D. ; Baker, C.A. ; Knox, R. ; Whiteman, C.A. / The Devensian periglacial record on Thanet, Kent, UK. In: Permafrost and Periglacial Processes. 2003 ; Vol. 14, No. 3. pp. 217-246.
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Murton, JB, Bateman, MD, Baker, CA, Knox, R & Whiteman, CA 2003, 'The Devensian periglacial record on Thanet, Kent, UK', Permafrost and Periglacial Processes, vol. 14, no. 3, pp. 217-246.

The Devensian periglacial record on Thanet, Kent, UK. / Murton, J.B.; Bateman, M.D.; Baker, C.A.; Knox, R.; Whiteman, C.A.

In: Permafrost and Periglacial Processes, Vol. 14, No. 3, 08.2003, p. 217-246.

Research output: Contribution to journalArticle

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AB - The Devensian periglacial record on Thanet, Kent, is traced from c. 88 to 74 ka and from c. 24 to 12 ka by optical luminescence dating of aeolian sand and silt in the periglacial stratigraphy. The record commences before 88 ka with valley cutting at Pegwell Bay. Valley filling had begun by c. 88 ka and continued to at least 74 ka, coinciding with a major episode of loess deposition in Europe. Permafrost aggradation commenced before c. 21 ka, brecciating near-surface chalk by ice segregation in permafrost and the overlying active layer. Deposition of aeolian sand (coversand) occurred at c. 24 21 ka, correlating with the Older Coversand I in mainland Europe. Permafrost degradation commenced at c. 21 ka, probably due to climate warming during Greenland Interstadial 2. The resulting active-layer deepening through ice-rich permafrost initiated soft-sediment deformation and formation of large-scale patterned ground in an active layer c. 2m deep. Renewed permafrost aggradation between c. 21.25 and 18 ka coincided with climate cooling during Greenland Stadial 2c and led to cryoturbation in a thinner active layer. Final permafrost degradation commenced no later than c. 14.7 ka, that is, the start of Greenland Interstadial 1e, and may have occurred to some extent during the climate warming associated with Greenland Stadial 2b (c. 19.5 16.9 ka). Renewed deposition of aeolian sand took place at c. 15.5 ka, coincident with loess deposition on Thanet. A final episode of aeolian sand deposition occurred at 12 ka, correlating with the Younger Coversand deposits that are widespread in northwest Europe and formed during Greenland Stadial 1.

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Murton JB, Bateman MD, Baker CA, Knox R, Whiteman CA. The Devensian periglacial record on Thanet, Kent, UK. Permafrost and Periglacial Processes. 2003 Aug;14(3):217-246.