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Echinoid burrow Bichordites monastiriensis from the Oligocene of NE Italy

100%

Bernardi M., Boschele S., Ferretti P., Avanzini M.

Acta Palaeontologica Polonica

2010

tom 55

nr 3

479-486

Several specimens of trace fossil Bichordites monastiriensis were discovered in two shallow water Oligocene sandstone beds from Valsugana (Trentino, NE Italy) representing the oldest documented occurrence for this ichnospecies. They are grazing−crawling (pascichnion−repichnion) structures and are occasionally associated with enlarged structures that can be interpreted as resting traces (cubichnia) and assigned to the ichnogenus Cardioichnus. The resulting Bichordites–Cardioichnus compound trace fossil is here described for the first time. In the basal part of some specimens, skeletal remains of Eupatagus ornatus were found in life position. This founding enables to widen the spectrum of known Bichordites tracemakers. Exceptional conditions of preservation of one specimen extending in two beds recording different environmental conditions gave an opportunity to document the effects of various taphonomical histories on the preservation of this traces.

Turtle tracks from the Late Jurassic of Asturias, Spain

76%

Avanzini M., Garcia-Ramos J. C., Lires J., Menegon M., Pinuela L., Fernandez L. A.

Acta Palaeontologica Polonica

2005

tom 50

nr 4

743-755

Although tracks of dinosaurs are well known from Upper Jurassic sediments, tracks of non−dinosaurian vertebrates are fairly rare. The Upper Jurassic Lastres Formations of Asturias in northern Spain contain many vertebrate tracksites that include footprints and trackways of non−dinosaurian tetrapods. Several of these tracks are natural casts of pentadactyl to tridactyl footprints with digits connected by arched structures. The digits are short with deep scratch marks oriented anteriorly. The Asturian tracks show a high degree of morphological similarity to other specimens previously described as possible turtle tracks. Observations from extant turtle trackways show some surprising similarities with the fossil material. The tracks are here interpreted as having been made by turtles partially buoyed by water or by turtles walking in a slightly wet subaerial environment.

Ograniczanie wyników

2 Acta Palaeontologica Polonica

2 Avanzini M.

1 Bernardi M.

1 Boschele S.

1 Fernandez L. A.

1 Ferretti P.

1 Garcia-Ramos J. C.

1 Lires J.

1 Menegon M.

1 Pinuela L.

1 2010

1 2005

Wyniki wyszukiwania

Echinoid burrow Bichordites monastiriensis from the Oligocene of NE Italy

Turtle tracks from the Late Jurassic of Asturias, Spain