West Coast Palaeolandscapes (1 of 2)

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Ken Murphy, Dyfed Archaeological Trust

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West Coast Palaeolandscapes (1 of 2)

  1. 1. West Coast Palaeolandscapes
  2. 2. Liverpool Bay as it was … Photo: RCAHMW…and as it is now
  3. 3. Reid had little formal education but, after studying in his sparetime joined the Geological Survey in 1874, became one of the Noah’ s Woodsforemost experts of his time on British geology andpalaeobotany.His 1913 book on “Submerged Forests” discussed theextensive evidence for coastal change in Britain. Clement Reid 1853- 1916
  4. 4. A wonderful study of the coasts ofBritain. From primary observationsof fossil remains and “moorlog”(peat deposits) he concludedthat…“The Dogger Bank once formed thenorthern edge of a great alluvialplain, occupying what is now thesouthern half of the North Sea”Shoreline set at 36m bathymetriccountour
  5. 5. „Doggerland‟(Prof. Bryony Coles)
  6. 6. The Colinda Harpoon"We were halfway between the two Northbuoys in mid-channel between the Leman andOwer..... I heard the shovel strike something. Ithought it was steel. I bent down and took itbelow. It lay in the middle of the block whichwas about 4 feet square and 3 feet deep. Iwiped it clean and saw an object quite black".Skipper Pilgrim E. Lockwoodinterviewed by Dr H . Muir Evans. 14th March 1932.
  7. 7. Photo: Martin Bell Submerged ForestsAbove Rhyl, DenbighshireBelow Borth, Ceredigion Photo: Nigel Nayling
  8. 8. Foreshore Archaeology. A glimpse of what maysurvive beneath the sea. Photos: Martin Bell
  9. 9. Lydstep Haven Prehistoric footprints of achild with a compared with a modern eight year old.
  10. 10. 2D Seismics3D Seismics
  11. 11. 2D seismic dataInterpretation of 2Dseismic data withcurrent seabedshown red and twoprehistoric riverchannels outlined ingreen.
  12. 12. Interpretation of 3D data –chrono-stratigraphy
  13. 13. The Shotton RiverProfessor Fred Shotton (1906-1990)
  14. 14. West CoastPalaeolandscapesPilot Project
  15. 15. 2D Lines and 3D Features2D „hits‟, maximum 40% failure rate in legacy 2D data sets. 14.75% in WCPP main project
  16. 16. Two big problems Data Availability & Resolution
  17. 17. Geophysical data procurement Liverpool Bay Bristol Channel
  18. 18. Geophysical data analysis and interpretationEach individual 3D survey was processedin Kingdom by Amplitude, Hilbert andRunningSUM methods, then timesliced at4 millisecond intervals.The visible features (highground, low ground andpalaeochannels) in eachtimeslice were then digitised inKingdom
  19. 19. Geophysical data analysis and interpretation Results of analysis and interpretation of all the 3D surveys

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