Abstract
Lower Lias sediments from the Danish island of Bornholm exhibit many sedimentary indications of tidal influence during their deposition. A section in the Sinemurian is interpreted as a regressive tidal flat with supratidal salt-marsh (coals and rootlet-beds), tidal flat (flaser- and wavy-bedded clays and sands), tidal creeks, storm scours and sand sheets, large scale metaripples and subtidal sand bars. The lack of calcareous fossils is probably due to post-depositional leaching in the uncemented sediments; but the scarcity of burrows and the lack of fauna may also reflect a reduced overall salinity, or the often unstable (thixotropic) substrate conditions. The presence of tidally influenced sediments on the margins of the Lias epeiric sea in Europe demonstrates that tidal effects should not be ignored when considering aspects of epicontinental sedimentation in the Mesozoic of Northern Europe.
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