Trace fossils from the Lower Jurassic Ciechocinek Formation, SW Poland
Keywords:
trace fossils, fine-grained clastics, brackish environment, Lower Jurassic, Częstochowa-Wieluń regionAbstract
Mud-silt deposits of the Lower Jurassic Ciechocinek Formation from the Częstochowa-Wieluń region arecharacterized by a low diversity ichnofossil association, which includes the ichnogenera Planolites, Palaeophycus, Helminthopsis, Gyrochorte, Protovirgularia and Spongeliomorpha as well as some unidentified pascichnia. This association points to deposition in a low-energy brackish environment with poorly oxygenated sediments. Changes of seafloor oxygenation, influenced by periodical bottom currents, resulted in various bioturbation intensities, which range from none to high.Downloads
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