Early Weichselian interstadial sediments at Härnösand, Sweden

• Published in: Boreas
• Main Authors: AMBROSIANI, KARIN GARCÍA, ROBERTSSON, ANN‐MARIE
• Format: Article in Journal/Newspaper
• Language: English
• Published: Wiley 1992
• Subjects: Betula nana; Tundra
• Online Access: http://dx.doi.org/10.1111/j.1502-3885.1992.tb00036.x; https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1502-3885.1992.tb00036.x; https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1502-3885.1992.tb00036.x

The till‐covered organic sediments at Härnösand have been resampled and reinvestigated with respect to their micro‐ and macrofossil content. The sediments were deposited in a shallow freshwater basin with a sandy substratum and probably under oligotrophic conditions. The regional vegetation consisted of a shrub or herb tundra, later changing into an open Betula forest with scattered Picea and Larix . In the lake, submerged plants such as Potamogeton filiformis and Isoëtes lacustris grew, together with Carex . On the shores the vegetation consisted of Betula nana , occasional Betula trees, Salix and Selaginella selaginoides . The beetle fauna suggests an average July temperature of 10–11°C. The flora indicates limited leaching and, thus, deposition during a relatively long and warm interstadial is suggested. The Härnösand sediments are subsequently correlated with the Brörup Interstadial.