page_title: Rotzo Formation
section_title: Ichnofossils
hierarchical_section_title: Rotzo Formation / Invertebrata / Ichnofossils
caption_attribution_description: Čeština: ichnofosílie (stopa po činnosti organismu) rodu Ophiomorpha zachovaná v pískovcích svrchního turonu nedaleko Pravčické brány, okres Děčín, ČR English: trace fossil Ophiomorpha preserved in sandstones of Late Turonian age near Pravčická brána Arch (Prebischtor), Děčín District, Czech Republic
context_page_description: The Rotzo Formation is a geological formation in Italy, dating to roughly between 189 and 183 million years ago and covering the Pliensbachian stage of the Jurassic Period in the Mesozoic Era. Has been traditionally classified as a Sinemurian-Pliensbachian Formation, but a large and detailed dataset of isotopic ¹³C and ⁸⁷Sr/⁸⁶Sr data, estimated the Rotzo Formation to span only over the whole Pliensbachian.
  Fossil prosauropod tracks have been reported from the formation. This formation was deposited within a tropical lagoon environment which was protected by oolitic shoals and bars from the open deep sea located to the east and towards the west. It is characterized by a rich paleontological content. It is notable mostly thanks to its great amount of big aberrant bivalves, among which is the genus Lithiotis, described in the second half of the nineteenth century. The unusual shape of Lithiotis and Cochlearites shells, extremely elongated and narrow, characterized by a spoon-like body space placed in a high position, rarely preserved, seems to suggest their adaptation to soft and muddy bottoms with a high sedimentation rate.
context_section_description: In the Western Venetian Prealps a shallow-water, oceanic carbonate platform system, the Trento platform, developed on the Early Jurassic, producing a large succession of massive to well-bedded white Limestones, several 100 m thick that are part of the Calcari Grigi Group, where the Rotzo Formation is the Upper Member. On the local limestone of the Rotzo Formation deep burrowing is a very common type of biogenic activity, as is shown due to the presence of a large characteristic network of burrows which reach down to the lagoonal, marly-clayey assigned strata, suggesting intense bioturbation by large unknown organisms, perhaps giant decapod
  crustaceans (Probably members of the family Erymidae), although, the burrows found aren't closely related to the ones of Shrimps or other decapods, but resemble those of
  Stomatopoda and Malacostraca. Other includes abandoned burrows, vertical biogenic action and infilling on the sea substrate.
caption: Ophiomorpha
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