São Mateus do Sul, bituminous shale facies: Artinskian, Brazil
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Mesosauridae
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| 25 individuals | ||||||||||
| UFRGS PV0186P to PV0190P, PV0192P, PV0193P, PV0195P to PV0199P, PV0208P, PV0210P, PV0211P, PV0212P*, PV0213P*, PV0215P, PV0217P, PV0218P, PV0275P to PV0278P, PV0283P, PV0284P*, PV0346P; DGM85-R; specimens marked by an asterisk are represented by isolated bones only; see also comments on taxonomic list | ||||||||||
| see common names | ||||||||||
Geography
| Country: | Brazil | State/province: | Paraná | County: | São Mateus do Sul |
| Coordinates: | 25.8° South, 50.4° West (view map) | ||||
| Paleocoordinates: | 47.4° South, 31.5° West (Wright 2013) | ||||
| Basis of coordinate: | estimated from map | ||||
| Geographic resolution: | small collection |
Time
| Period: | Permian | Epoch: | Cisuralian |
| Stage: | Artinskian | 10 m.y. bin: | Permian 2 |
| Key time interval: | Artinskian | ||
| Age range of interval: | 290.1 - 283.3 m.y. ago |
Stratigraphy
| Geological group: | Passa Dois | Formation: | Irati | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: Soares (2003) states that the fossils come from the Irati Formation but only gives "Permian" as the most precise age specification. However, in a quite recent publication it is stated that the Irati Formation is Artinskian in age, based on absolute ages obtained from zircons from a bentonite layer (Santos et al., 2006, Gondwana Res. 9). | |||||
Lithology and environment
| Primary lithology: | black carbonaceous "shale" | ||
| Secondary lithology: | "limestone" | ||
| Includes fossils? | Y | ||
| Lithology description: " [...] two beds of black bituminous shale interleaved with a succession of interbedded shales and limestones. Oelofsen and Araújo (1983) have interpreted this facies as representing sedimentation in relatively deep, stratified waters that were anoxic at the bottom. Mostly articulated (Class I) mesosaur remains occur in the upper shale bed, concentrated particularly in a 30 cm layer. Nevertheless, isolated bones (Class III) also occur." (Soares, 2003). | |||
| Environment: | offshore | Tectonic setting: | cratonic basin |
| Geology comments: " [...] deeper basin environments [...] " (Soares, 2003). | |||
Taphonomy
| Size of fossils: | macrofossils |
| Preservation of anatomical detail: | good |
| Articulated whole bodies: | none |
| Associated major elements: | many |
| Disassociated major elements: | some |
| Temporal resolution: | time-averaged |
| Spatial resolution: | autochthonous |
Collection methods and comments
| Collection methods: | survey of museum collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: UFRGS PV = vertebrate palaeontoloogy collections of the Universidade Federal do Rio Grande do Sul, Porto Alegre
DGM = Divisão de Geologia e Mineralogia, Departamento Nacional de Produção Mineral | |
| Taxonomic list comments:Soares (2003) gives no specific assignment of the Mesosaurs. Since all mesosaur genera are considerd monotypic the Mesosaurus specimens listed by Soares are referred to as Mesosaurus tenuidens in the taxonomic list. | |
Metadata
| Also known as: | Paraná Basin | ||
| Database number: | 90423 | ||
| Authorizer: | J. Mueller | Enterer: | T. Liebrecht |
| Modifier: | T. Liebrecht | Research group: | vertebrate |
| Subset of collection #: | 90190 | ||
| Created: | 2009-07-20 06:14:17 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | authorizer only | Released: | 2012-07-20 06:14:17 |
| Creative Commons license: | CC0 | ||
Reference information
Primary reference:
| 30368. | M. B. Soares. 2003. A taphonomic model for the Mesosauridae assemblage of the Irati Formation (Paraná Basin, Brazil). Geologica Acta 1(4):349-361 [J. Mueller/T. Liebrecht] |