1975•Geologiska Föreningen i Stockholm FörhandlingarRequires access
The petrography of gravel deposits on the island of Gotland in the Baltic
Lars-König Königsson, Sven-Ingemund Svantesson
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Abstract
Differences in particle roundness and petrography have been studied in more than 250 gravel pits all over Gotland. The recording of petrographic properties was. however, restricted to the differences in the percentual representation of limestones, marlstone. Burgsvik sandstone, and the erratic, Precambrian elements. Gotland may be divided into distinct regions, according to the petrography of the gravels. The differences are interpreted as being due, to a certain extent, to the influence of various ice flows over the island, where the ice flows carried material of specific petrographic composition. The possibility of tracing the source formation of littoral accumulations by using petrographic analysis has been investigated. It is considered that such analyses alone are not sufficient to allow safe conclusions to be drawn.