Trace fossile de Circulichnis, un enregistrement de la recherche de nourriture : nouvelles données obtenues à partir de dépôts oligo-miocènes du Nord de l’Italie
| Autor: | Alfred Uchman, Bruno Rattazzi |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
010506 paleontology
Apennines 060101 anthropology biology Helminthopsis molasse General Engineering Sediment 06 humanities and the arts Structural basin Trace fossil palaeoecology biology.organism_classification Burrow 01 natural sciences Deep sea Northern italy ethological model Paleontology Bed 0601 history and archaeology ichnotaxonomy Geology 0105 earth and related environmental sciences |
| Popis: | Circulichnis is a puzzling, ring-like trace fossil preserved on bedding planes. It is represented mostly by its type ichnospecies C. montanus, which is characterized by an evenly circular or elliptical course. A new ichnospecies, C. ligusticus, is distinguished based on material from deep-sea Oligocene–Miocene deposits of the Tertiary Piemonte Basin, NW Italy. It shows a winding or irregular course. A new model of Circulichnis is proposed as an exploration burrow produced mostly by the trace makers of Helminthoidichnites, Gordia, or Helminthopsis, as it moved to a different sediment layer to checking its feeding utility. This type of behaviour occurred already by the Ediacaran and is common in marine, mostly deep-sea bedded sediments. The trace makers belong mostly to polychaetes in marine sediments and to oligochaetes in continental sediments. |
| Databáze: | OpenAIRE |
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