Ignorer kommandoer på båndet
Gå til hovedindhold
Naviger op
Log på
> Forsiden > Publikationer > Geological Survey of Denmark and Greenland Bulletin > Vol. 03 Geol. Surv. Den. Greenl. Bull

Geological Survey of Denmark and Greenland Bulletin
3 - 2004

​Late Quaternary environmental changes recorded in the Danish marine molluscan faunas

ForsideK. Strand Petersen

The main result of this work was the comparison between the fossil faunas and the mollusc faunas now living before our eyes using the C.G.J. Petersen bottom community concept step by step in the seven stages from the Eemian to the Subatlantic within the seven regions in the Danish realm.

It appears that the differences in facies made the difference between the regions and that the more temperate Eemian marine fauna was only connected with the shallow water environment.

The climatic changes recorded in the mollusc fauna have given a clear record as far as the main trends are concerned – the interglacial/glacial cycle, however, the climatic changes during the Holocene were small.

  • Colophon, contents, abstract, introduction
    Danish sites with marine sediments
    K. Strand Petersen
    nr3_p001-023.pdf (pdf-file ~0.4 Mb)
  • The Danish Late Quaternary marine molluscs
    K. Strand Petersen
    nr3_p024-097.pdf (pdf-file ~0.9 Mb)
  • The Skagen Well
    K. Strand Petersen
    nr3_p098-112.pdf (pdf-file ~0.2 Mb)
  • The Skagen Well – Fig. 93
    K. Strand Petersen
    nr3_Fig_93.pdf (pdf-file ~0.3 Mb)
  • The environmental changes through time in the seven sectors based on the molluscan records
    K. Strand Petersen
    nr3_p112-151.pdf (pdf-file ~0.5 Mb)
  • The environmental changes within the seven regions through the Late Quaternary evaluated by the molluscan communities met within the seven stages
    K. Strand Petersen
    nr3_p151-171.pdf (pdf-file ~0.2 Mb)
  • Concluding remarks, Acknowledgements, References, List of Synomyms, Index of species
    K. Strand Petersen
    nr3_p172-196.pdf (pdf-file ~0.2 Mb)
  • Appendix 1: Recent species, Subfossil species, Recent species sorted after climatic affinities, Subfossil species sorted after climatic affinities
    K. Strand Petersen
    nr3_p197-212.pdf (pdf-file ~0.1 Mb)
  • Appendix 2: The washed samples
    K. Strand Petersen
    nr3_p213-217.pdf (pdf-file ~0.1 Mb)
  • Appendix 3: Sedimentological and fossil data from the Skagen Wells 3 and 4
    K. Strand Petersen
    nr3_p218-257.pdf (pdf-file ~0.4 Mb)
  • Appendix 4: Radiocarbon dating of the Skagen Core
    J. Heinemeier
    nr3_p258-259.pdf (pdf-file ~0.1 Mb)
  • Appendix 5: Evaluation of the recent marine bivalve bottom community off the Limfjord isthmus based on 61 van Veen grab samples
    K. Strand Petersen
    nr3_p260-263.pdf (pdf-file ~0.4 Mb)
  • Appendix 6: The Molluscan species recorded within the 7 areas through the 7 stages
    K. Strand Petersen
    nr3_p264-268.pdf (pdf-file ~0.4 Mb)

  • Download the entire Bulletin 3 excluding appendices, p1-196
    K. Strand Petersen
    nr3_p001-196_excl_app.pdf (pdf-file ~2.1 Mb)
  • Download the appendices for Bulletin 3, p197-268
    K. Strand Petersen
    nr3_p197-268_apps.pdf (pdf-file ~1.3 Mb)


Late Quaternary, marine deposits in Denmark have yielded 247 subfossil species of molluscs. The sites are presented, and comparisons are made between the subfossil mollusc assemblages and the 278 shell-bearing mollusc species presently living in the Danish seas. 184 species are common to the two groups. The 63 species no longer occurring around Denmark are used as indicators of changing environmental conditions, including temperature, salinity and depth, throughout the last 130 000 years. Seven modern faunal regional units are defined and considered: the Bælt, the Baltic, the Kattegat, the Limfjord, the North Sea and the Vendsyssel regions, and the Skagen area based on the Skagen III Well DGU File No. 1.287. The Late Quaternary, marine, shell-bearing molluscs, comprising 341 subfossil and recent species, are characterised from the point of view of climatic (i.e. Arctic, Subarctic, Boreal and Lusitanian) affinities and animal–sediment relationships. On this background the faunal and environmental evolution recorded in the 217 m long Skagen Well core is analysed and described. The mollusc assemblages in the Skagen sequence indicate a deeper-water facies during the Eemian, the Weichselian and the older Holocene in contrast to what hitherto was known in other parts of the Danish area during the Late Quaternary. For the Skagen Well the chronozones Preboreal/Boreal, Atlantic, Subboreal and Subatlantic can be identified by 14C dating. The environmental changes within the seven regions through the Late Quaternary are evaluated by depicting the molluscan communities encountered in the seven Late Quaternary stages together with remarks on studies of the neighbouring areas. By following the marine communities through the Late Quaternary in the light of the classical bottom communities sensu C.G.J. Petersen, it is demonstrated how facies have changed both through time and space within the Danish marine realm. The well-established, more temperate Eemian marine fauna was closely associated with shallow-water environments. The inferred climatic changes reflect an interglacial–glacial cycle. However, the climatically induced changes during the Holocene in the marine environment were small and overshadowed by the facies changes. Out of the 341 species recorded in this study, 140 occur in the Eemian, 36 in the Early/Middle Weichselian and 41 in the Late Weichselian. The Holocene fauna is represented by 183 species of shell-bearing molluscs, of which the first recorded occurrence of 148 species has been radiocarbon-dated.


Geological Survey of Denmark and Greenland Bulletin kan købes hos:

Øster Voldgade 10, 1350 København K
Tlf.: 38 14 20 00, e-post: bogsalg@geus.dk

Pris kr. 200 (ekskl. moms)

Vol. 3 Geol. Surv. Den. Greenl. Bull.