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Petre?ti-Arini - an important but ephemeral Late Cretaceous continental vertebrate site in the southwestern Transylvanian Basin, Romania

Petre?ti-Arini - an important but ephemeral Late Cretaceous continental vertebrate site in the southwestern Transylvanian Basin, Romania
Petre?ti-Arini - an important but ephemeral Late Cretaceous continental vertebrate site in the southwestern Transylvanian Basin, Romania
The Transylvanian region of Romania preserves some of the most unusual and iconic dinosaurs in the global fossil record, including dwarfed herbivores and aberrant carnivores that lived during the very latest Cretaceous (Maastrichtian) in an ancient island ecosystem (the Ha?eg Island). A series of artificial outcrops recently exposed during a hydroelectric project, the Petre?ti-Arini section near Sebe? in the Transylvanian Basin, records a 400+ meter sequence documenting the transition from fully marine to terrestrial environments during the Campanian–Maastrichtian. Calcareous nannofossil biostratigraphy indicates that the lower marine beds in this section, part of the uppermost Boze? Formation, can be assigned to the CC22 biozone, corresponding to the lower–mid upper Campanian. These beds smoothly transition, via a brackish-water unit, into the fully continental Maastrichtian Sebe? Formation. Dinosaur and pterosaur fossils from the uppermost Boze? Formation can be assigned a late Campanian age making them the oldest well-dated terrestrial fossils from the Ha?eg Island, and indicating that the classic Ha?eg dinosaur fauna was becoming established by this time, coincident with the first emergence of widespread land areas. Vertebrate fossils occur throughout the overlying Sebe? Formation at the site and are dominated by the small-bodied herbivorous dinosaur Zalmoxes. The dominance of Zalmoxes, and the absence of many taxa commonly seen elsewhere in Maastrichtian sites in Romania, suggests the possibility that either the Petre?ti-Arini section preserves a somewhat unusual near-shore environment, or the earliest Ha?eg Island dinosaur communities were structured differently from the more diverse communities later in the Maastrichtian. Alternatively, due to the limited sample size available from the studied succession, it is also conceivable that sampling biases give an incomplete portrayal of the Petre?ti-Arini local fauna. Support for any one of these alternative hypotheses requires further data from Petre?ti-Arini as well as from the larger Transylvania area.
Campanian, Maastrichtian, Dinosaurs, Mammals, Calcareous nannofossils, Romania
0195-6671
13-38
Vremir, Mátyás
4b606297-070e-4359-98dd-5e80f4f383d0
Bălc, Ramona
97d30354-3af5-45b8-87ed-833eed120966
Csiki-Sava, Zoltan
54658049-b7b2-43fb-ba6d-97fc5068957c
Brusatte, Stephen
1d1dea61-d77c-4a6e-bb84-86a76352ca24
Dyke, Gareth
600ca61e-b40b-4c86-b8ae-13be4e331e94
Naish, Darren
6cd448f6-99cc-4c45-93d1-bdd24ee3d281
Norell, Mark
59dfbf0e-1a22-42aa-956e-c98496b733ee
Vremir, Mátyás
4b606297-070e-4359-98dd-5e80f4f383d0
Bălc, Ramona
97d30354-3af5-45b8-87ed-833eed120966
Csiki-Sava, Zoltan
54658049-b7b2-43fb-ba6d-97fc5068957c
Brusatte, Stephen
1d1dea61-d77c-4a6e-bb84-86a76352ca24
Dyke, Gareth
600ca61e-b40b-4c86-b8ae-13be4e331e94
Naish, Darren
6cd448f6-99cc-4c45-93d1-bdd24ee3d281
Norell, Mark
59dfbf0e-1a22-42aa-956e-c98496b733ee

Vremir, Mátyás, Bălc, Ramona, Csiki-Sava, Zoltan, Brusatte, Stephen, Dyke, Gareth, Naish, Darren and Norell, Mark (2014) Petre?ti-Arini - an important but ephemeral Late Cretaceous continental vertebrate site in the southwestern Transylvanian Basin, Romania. Cretaceous Research, 49, 13-38. (doi:10.1016/j.cretres.2014.02.002).

Record type: Article

Abstract

The Transylvanian region of Romania preserves some of the most unusual and iconic dinosaurs in the global fossil record, including dwarfed herbivores and aberrant carnivores that lived during the very latest Cretaceous (Maastrichtian) in an ancient island ecosystem (the Ha?eg Island). A series of artificial outcrops recently exposed during a hydroelectric project, the Petre?ti-Arini section near Sebe? in the Transylvanian Basin, records a 400+ meter sequence documenting the transition from fully marine to terrestrial environments during the Campanian–Maastrichtian. Calcareous nannofossil biostratigraphy indicates that the lower marine beds in this section, part of the uppermost Boze? Formation, can be assigned to the CC22 biozone, corresponding to the lower–mid upper Campanian. These beds smoothly transition, via a brackish-water unit, into the fully continental Maastrichtian Sebe? Formation. Dinosaur and pterosaur fossils from the uppermost Boze? Formation can be assigned a late Campanian age making them the oldest well-dated terrestrial fossils from the Ha?eg Island, and indicating that the classic Ha?eg dinosaur fauna was becoming established by this time, coincident with the first emergence of widespread land areas. Vertebrate fossils occur throughout the overlying Sebe? Formation at the site and are dominated by the small-bodied herbivorous dinosaur Zalmoxes. The dominance of Zalmoxes, and the absence of many taxa commonly seen elsewhere in Maastrichtian sites in Romania, suggests the possibility that either the Petre?ti-Arini section preserves a somewhat unusual near-shore environment, or the earliest Ha?eg Island dinosaur communities were structured differently from the more diverse communities later in the Maastrichtian. Alternatively, due to the limited sample size available from the studied succession, it is also conceivable that sampling biases give an incomplete portrayal of the Petre?ti-Arini local fauna. Support for any one of these alternative hypotheses requires further data from Petre?ti-Arini as well as from the larger Transylvania area.

Full text not available from this repository.

More information

Published date: 1 May 2014
Keywords: Campanian, Maastrichtian, Dinosaurs, Mammals, Calcareous nannofossils, Romania
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 361830
URI: http://eprints.soton.ac.uk/id/eprint/361830
ISSN: 0195-6671
PURE UUID: c64b3046-d520-40ca-b97d-14ca1e792797

Catalogue record

Date deposited: 04 Feb 2014 10:08
Last modified: 16 Jul 2019 21:13

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