There has bee a large gap in research activities about the Siljan structure after the closure of the Deep Gas Project in 1991. Traces of gas were found, but not of any economic interest. The large impact structure has recently again become of interest for study, this time for geothermal energy resources and for research focused on impact tectonics. This review has been prepared to encourage further studies of this extraordinary geological structure, which is easily accessible and where large amounts of data have been gathered by the efforts of the Deep Gas project and by the systematic mapping provided by the Geological Survey of Sweden.
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