Samlinger Lokaliteter TidstavleFaunalister Blin


Aves phylum

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Katalognummer:
757
Accessionsnummer:
DK 771
Samling:
Danekræsamlingen
Samler:
Statens Naturhistorisk Museum
Finder:
Ole Barsøe Hansen
Bestemt af:
Estelle Bourdon
Lokalitet:
Trelde Næs, Fredericia
Stratigrafi:
Lillebælt Ler Formationen
Periode:
Eocæn [Ypresien/Lutetien]
Type:
Konkretion
Sediment:
Mangancarbonat

Billede

Foto ©: Sten Lennart Jakobsen


 Beskrivelse:   af  Estelle Bourdon 
DK 771 fuglekranium i konkretion

Fossil bird - skull in concretion.
The specimen consists of a remarkably well-preserved skull (braincase plus base of beak) enclosed in a calcareous concretion. The braincase is nearly complete, preserved in three dimensions and undistorted. Part of the upper beak is preserved, most probably in anatomical connection with the braincase. There is no doubt that further preparation will expose most of the beak as well as the ventral part of the braincase. The braincase itself is exposed in dorsal and caudal views. It belonged to a fairly large bird the size of a crow. The postorbital region is very wide compared to the interorbital region. The bone is strongly abraded in some areas of the braincase, so that the endocranial cast is visible. The large size of the forebrain (telencephalon) and the presence of a wulst (sagittal eminence) on the dorsal part of the forebrain demonstrate a level of neural development well within the range of living bird species. The prominent wulst suggests that this extinct species had a well-developed visual sense. Further study on this specimen (e.g. X-ray micro computed tomography) will undoubtedly shed new light on the early evolution of modern birds. Overall, I think that this specimen is remarkable, highly informative, and is ought to be declared Danekræ.

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