Abstract
Abstract In the coast district of Norrbotten, Northern Sweden, at the Bothnian Bay, the clays generally have a high sulphide content (> 1 % S) and black colour. Different colour zones can be distinguished in the black clays. Through pollen and diatom analysis these zones have been correlated with the late Quaternary development of the Baltic thus: 1. Even black or greyish black clay. Latter part of the Litorina period. 2. Thin black layers in a stratified clay (fig. 1). Litorina maximum. 3. Black clay. Beginning of the Litorina period. 4. Black stripes or layers in a homogenous clay. Ancylus period and the very end of the Yoldia period.
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