188 new and previously published radiocarbon dates on Holocene material from Disko Bugt, central West Greenland, are presented together with relevant informations (laboratory number, place name, dated material, geografic coordinates, altitude and 613Cvaluej about the dates.

Morten Rasch: Danish Polar Center, Strandgade 100 H, 1401
Copenhagen K., Denmark.

This note contains a compilation of radiocarbon dates on Holocene organic material from altitudes below 150 m a.s.l. in Disko Bugt (68°30'N - 70°45'N; 50°00'W - 55°30'W), central W.Greenland. A locality map showing the field location of the dated samples is given in Fig. 1 (see next page). Table 1 contains the radiocarbon dates and relevant information (laboratory number, place name, dated material, geografic coordinates, altitude and ö devalue) about the dates. In both Fig. 1 and Table 1 place names are spelled in accordance with current Greenlandic orthography. Thus, the place names might differ a little from the similar place names on current topographic maps.

Corrections of Dates

In Table 1, all dates on terrestrial material (incl. mud) with öIJC-valuesö^1JC-values given have been corrected for isotopic fractionation by normalizing to ö 13_C = -25.0 %0%₀ PDB, while all dates on marine material with 613C-values6¹³C-values given have been corrected for isotopic fractionation by normalizing to ö 13_C = 0.0 %o PDB. The numbers in the column 'Corr. type' in Table 1 have the following meanings: 1. The date has not been corrected for isotopic fractionation. 2. The date was corrected for isotopic fractionation by the laboratory/authors) of first publication. 3. The date has been corrected for isotopic fractionation in this work.

No corrections for marine reservoir effects have been made to the dates. The marine reservoir effect in West Greenland is considered to be 410 years (Rasmussen & Rahbek 1996), which is by chance equal to the correction allready done by normalizing the dates on marine material to 0.0 %c PDB (Mook & van de Plassche 1986).

Dates without ö^I3C-measurements are normaly not corrected for isotopic fractionation by the laboratories. However, the Tandem Accelerator Laboratory in Upssala assume 613C-values6¹³C-values depending on the dated material, and they correct their dates for isotopic fractionation according to the assumed 613C-values.6¹³C-values. Date UA-1785 was assumed by the laboratory in Uppsala to have a ÖI3C-valueÖ¹³C-value of -21.0 %o PDB. The laboratory corrected the date to 513C5¹³C = -25.0 %o PDB. Later, Bennike et al. (1994) have corrected the date to 613C6¹³C = 0.0 %0%₀ PDB. Dates UA-1786, UA-1788, UA-1789 and UA-1790 were assumed by the laboratory in Uppsala to have 613C-values6¹³C-values = 0.0 %c PDB. The laboratory corrected the dates to 613C6¹³C = -25.0 %c PDB. Later, Bennike et al. (1994) have corrected the dates to 513C5¹³C = 0.0 %0%₀ PDB. The corections of Bennike et al. (1994) have been applied in this work, because they make the Uppsala dates comparative with uncorrected dates. Besides the dates from Uppsala, all dates without 613C-values6¹³C-values have not been corrected for isotopic fractionation. Errors introduced by lack of ÖI3CÖ¹³C corrections are considered to be less than ±80 years on shell samples, while dates on terrestrial samples are considered to be up to 200 years too young.

Sources for Dates

The numbers in front of the references below refer to the
numbers in the column 'Ref. no.' in Table 1.

1. Harder, P., Jensen, A. S. & Laursen, D. (1949): The
marine Quaternary sediments in Disko Bugt. Meddelelser
om Grønland 149(1): 1-85.

2. Laursen, D. (1950): The stratigraphy of the marine
Quaternary deposits in west Greenland. Meddelelser om
Grønland 151(1): 1-142.

3. Meldgaard, J. (1952): A paleo-Eskimo culture in West
Greenland. American Antiquity 17(3): 222-230.

4. Mathiassen, Th. (1958): The Sermermiut excavations
1955. Meddelelser om Grønland 161(3): 1-52.

5. Tauber, H. (1960a): Copenhagen natural radiocarbon
measurements 111, corrections to radiocarbon dates made

with the solid carbon technique. Am. Journ. Science RadiocarbonSuppl.
2: 5-11.

6. Tauber, H. (1960b): Copenhagen radiocarbon dates
IV. Am. Journ. Science Radiocarbon Suppl. 2: 12-25.

7. Tauber, H. (1964): Copenhagen radiocarbon dates VI.
Radiocarbon 6:215-225.

8. Fredskild, B. (1967): Paleobotanical investigations at
Sermermiut, Jakobshavn, West Greenland. Meddelelser om
Grønland 178(4): 1-54.

9. Larsen, H. & Meldgaard, J. (1968): Paleo-Eskimo cultures
in Disco Bay, West Greenland. Meddelelser om
Grønland 161(2): 1-75.

10. Weidick, A. (1968): Observations on some Holocene
glacier fluctuations in West Greenland. Meddelelser om
Grønland 165(6): 1-202.

11. Tauber, H. (1968): Copenhagen radiocarbon dates
VII. Radiocarbon 10(2): 295-327.

12. Weidick, A. (1972a): Holocene shore-lines and
glacial stages in Greenland - an attempt at correlation.
GGU-rapport 41: 1-39.

13. Weidick, A. (1972b): C!4 dating of survey material
performed in 1971. GGU-rapport 45: 58-67.

14. Weidick, A. (1973): Cl4C14 dating of survey material
performed in 1972. GGU-rapport 55: 66-75.

15. Weidick, A. (1974): Cl4C14 dating of survey material
performed in 1973. GGU-rapport 66: 42-44.

16. Donner, J. & Jungner, H. (1975): Radiocarbon dating
of shells from marine Holocene deposits in the Disko Bugt
area, West Greenland. Boreas 4: 25-45.

17. Donner, J. (1978): Holocene history of the west coast
of Disko, central West Greenland. Geografiska annaler
60(A): 63-72.

18. Bojsen, T. & Frederiksen, L. (1980): Kystmorfologi ved Ivisarqut og Narssarssuk. In: Engraf, A., Nielsen, J., Nielsen, N., Humlum, O. (eds.): Arktisk geomorfologi, Enoks Havn, Disko 1978. Geonoter 5: 31-64.

19. Meldgaard, J. (1983): Qajå, en køkkenmødding i
dybfrost. Feltrapport fra arbejdsmarken i Grønland.
Nationalmuseets arbejdsmark 1983: 83-96.

20. Møbjerg, T. (1986): A contribution to paleoeskimo
archaeology in Greenland. Arctic Anthropology 23: 19-56.

21. Foged, N. (1989): The subfossil diatom flora of four
geographically widely separated cores in Greenland.
Meddelelser om Grønland Bioscience 30: 1-75.

22. Ingölfsson, O. et al. (1990): Paleoclimatic implications of an early Holocene glacier advance on Disko Island, West Greenland. Boreas 19: 297-311.

23. Frich, P. & Ingölfsson, O. (1990): Det holocæne sedimentationsmiljø ved Igpik samt en model for den relative landhævning i Disko Bugt, Vestgrønland. DGFårsskrift 1987-89: 1-10.

24. Böcher, J. & Fredskild, B. (1993): Plant and arthropod remains from the paleo-Eskimo site on Qeqertasussuk, West Greenland. Meddelelser om Grønland, Geoscience 30: 1-35.

25. Bennike, 0., Hansen, K. 8., Knudsen, K. L., Penney, D. N. & Rasmussen, K. L. (1994): Quaternary marine stratigraphy and geochronology in central West Greenland. Boreas 23: 194-215.

26. Grønnow, B. (1994): Qeqertasussuk - the archaeology of a frozen Saqqaq site in Disko Bugt, West Greenland. In: Morrison,D. & Pilon J.L. (eds.): Threads of Arctic Prehistory: Papers in Honour of William E.Taylor jr., Canadian Museum of Civilization, Mercury Series, Archaeological Survey of Canada Paper 149: 197-238.

27. Humlum, O. (1994, pers.comm.): Institute of Geography,
University of Copenhagen, Øster Voldgade 10,
DK-1350 Copenhagen K, Denmark.

28. Bennike, O. (1995): Paleoecology of two lake basins
from Disko, West Greenland. Journal of Quaternary
Science 10: 149-155.

29. Bennike, O. (1995, pers.comm.): Ole Bennike,
Geological Museum, University of Copenhagen, Øster
Voldgade 5-7, DK-1350 Copenhagen K, Denmark.

30. Rahbek, U. (1995, pers.comm.): Uffe Rahbek, The
Carbon-14 Dating Laboratory, National Museum of
Denmark, Ny Vestergade 11, DK-1471 Copenhagen K.

31. Grønnow, B. (1995, pers.comm.): Bjarne Grønnow,
Institute of Archaeology and ethnology, Univsity. of
Copenhagen, Vandkunsten 5, DK-1467 Copenhagen K.,

32. Frich, P. (1995, pers.comm.): Povl Frich, Danish
Meteorological Institute, Lyngby vej 199, DK-2100
Copenhagen 0, Denmark.

33. Rasch, M. & Nielsen, N. (1995): Coastal morphostratigraphy and Holocene relative sea level changes at Tuapaat, southeastern Disko Island, central West Greenland. Polar Research 14(3): 277-289

34. Rasch, M., Jakobsen, B. H., Nielsen, N. (1997): Geomorphology and sedimetary record of three cuspate forelands as indicators of Holocene relative sea-level changes, Disko, West Greenland. Geografisk Tidsskrift, Danish Journal of Geography 97, 33-45.

35. Rasch, M. & Jensen, J.F. (submitted): Ancient Eskimo dwelling sites and Holocene relative sea level changes in southern Disko Bugt, central West Greenland. Polar Research.

36. Rasch, M. & Peltier, W.R. (in prep.): Holocene
relative sea level changes in Disko Bugt, West Greenland.

37. This work.

Acknowledgements

B. Grønnow, U. Rahbek and J. Meldgaard are thanked for putting unpublished datings at my disposal. O. Humlum is thanked for clarifying uncertainties about the geographical coordinates of some of the datings from Disko. U. Rahbek and J. Heinemeier are thanked for critical comments.

References

Bennike, 0., Hansen, K. 8., Knudsen, K. L, Penney, D. N. & Rasmussen, K. L. (1994): Quaternary marine stratigraphy and geochronology in central West Greenland. Boreas 23: 194-215.

Mook, W. G. & van de Plassche, O. (1986): Radiocarbon dates. In: van de Plassche, O. (ed.): Sea-level research: a manual for the collection and evaluation of data. Geo Books, Norwich: 525-560.

Rasmussen, K. L, Rahbek, U. (1996): The 14_C reservoir effect in Greenland. In: Grønnow, B. (ed.): The Paleo- Eskimo Cultures of Greenland. Danish Polar Center, Copenhagen: 237-242.

Table 1: Radiocarbon dates from Disko Bugt, central West
Greenland, (the following 5 pages).