J. Ising, Late Weichselian pollen stratigraphy, clay varve chronology and paleomagnetic secular variations in Lake Bolmen, Smaland, south Sweden, BOREAS, 30(3), 2001, pp. 189-204
Pollen analysis. glacial varve chronology and palaeomagnetic measurements w
ere carried out on Late Weichselian lake-sediment, from Southwestern Smalan
d, south Sweden. The sequence is correlated to the GRIP event stratigraphy.
expressed in calendar years BP, and covers the period from the deglaciatio
n at c. 14400 to 11 300 calendar years BP. The series encompasses c. 930 va
rves and has been connected to the local varve chronology. Varve thickness
increases markedly after the Older Dryas stadial, which indicates an accele
rated deglaciation and melting of dead ice, The pollen diagram displays the
vegetation development from the deglaciation at c. 14400 calendar years BP
to the transition to the Holocene. The vegetation succession start, with a
n arctic pioneer vegetation at the deglaciation, changes to a more stable t
undra environment and displays a development which concurs with the traditi
onal lateglacial pollen stratigraphy for southern Sweden, A palaeomagnetic
secular variation curve is presented displaying two westerly declination sw
ings at 14 200-13 800 and 12 800-11 600 calendar years BP, respectively. Th
e upper one can be recognized from other palaeomagnetic stratigraphies from
southern Sweden and Estonia.