A giant boring in a Silurian stromatoporoid analysed by computer tomography

• Autorzy: Beuck L , Wisshak M. , Munnecke A. , Freiwald A.
• Języki publikacji: EN

Abstrakty

EN

This study describes the largest known Palaeozoic boring trace, Osprioneides kampto igen. et isp. nov., found within a stromatoporoid Densastroma pexisum from the Upper Visby Formation (lower Wenlock, Silurian) on the island of Gotland, Sweden. Differences between the physical properties of the stromatoporoid and the dense micritic infilling of the borings allowed the application of the CT−scan technology for the 2D and 3D−visualisation of this rare trace. The additional application of a stereoscopic technique on these CT images and movies enhances its value for unravelling spatial orientations. This non−destructive method has a great potential for future macroas well as microboring analyses. The trace maker, most likely a worm, infested the hosting colony post−mortem with up to 120 mm long borings measuring 5–17 mm in diameter. Smaller forms of Trypanites and Palaeosabella within the same stromatoporoid preferentially occur in the outer coenosteum and occasionally in abandoned borings of O. kampto. The stratigraphic position of O. kampto follows the “Great Ordovician Biodiversification Event” in time, and reflects the increase in diversity of boring species. Borings with penetration depths of 120 mm are, however, unique findings for the Palaeozoic and were not exceeded until some 260 million years later (Bajocian, Middle Jurassic) when the “Mesozoic Marine Revolution” led to convergent reinventions as a result of enhanced predation, grazing pressure, and ecospace competition.

Słowa kluczowe

EN

Upper Visby Formation; computer tomography; Sweden; Densastroma pexisum; paleontology; Gotland Island; Silurian; stromatoporoid; trace fossil; Osprioneides kampto; analysis

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 2008
• Tom: 53
• Numer: 1
• Opis fizyczny: p.149-160,fig.,ref.

Twórcy

autor

Beuck L

• Friedrich-Alexander Universitat Erlangen-Nurnberg, Loewenichstr.28, D-91054 Erlangen, Germany

autor

Wisshak M.

autor

Munnecke A.

autor

Freiwald A.

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