page_title: Drzewica Formation
section_title: Gastropoda
hierarchical_section_title: Drzewica Formation / Paleofauna / Invertebrates / Gastropoda
caption_attribution_description: Probably Viviparus viviparus from the Betuwe, the Netherlands
context_page_description: The Drzewica Formation is a geologic formation in Szydłowiec, Poland. It is late Pliensbachian age. Vertebrate fossils have been uncovered from this formation, including dinosaur tracks. The Drzewica Formation is part of the Depositional sequence IV-VII of the late lower Jurassic Polish Basin, with the IV showing the presence of local Alluvial deposits, with possible meandriform deposition origin, dominated in Jagodne and Szydłowiec, while delta system occurred through the zone of the modern Budki. The sequence V shows a reduction of the erosion in the Zychorzyn borehole of the Drzewica Formation, showing changes on the extension of the marine facies, where upper deposits change from Alluvial to Deltaic-Seashore depositional settings. VI-VII facies where recovered on the Brody-Lubienia borehole, with a lower part exposed on the village of Smilów that shows a small fall of the Sea level.
  The stathigraphic setting of the dinosaur tracks reported from the formation suggest a Seashore or Deltaic barrier. Body fossils reported include bivalves, palynology, fossil trunks, roots.
caption: Example of extant specimen of Viviparus
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