Leidapo ML-31-33: Anisian, China
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Lucinida
- Lucinidae
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Schafhaeutlia laubei
(Bittner 1895)
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Bivalvia
- Trigoniida
- Myophoriidae
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Elegantinia cf. venusta
Chen 1976
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Bivalvia
- Mytilida
- Mytilidae
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Modiolus dimidiatus
(Münster 1841)
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Bivalvia
- Ostreida
- Cassianellidae
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Cassianella sulcata
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| Cassianella ecki sulcata | ||||||||||
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Cassianella simplex
Chen 1976
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Bivalvia
- Pectinida
- Limidae
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Mysidioptera aff. vixcostata
Stoppani 1860
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Bivalvia
- Pectinida
- Hunanopectinidae
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Leptochondria subillyrica
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Bivalvia
- Pectinida
- Dimyidae
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Protostrea sinensis
(Hsu 1943)
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| see common names | ||||||||||
Geography
| Country: | China | State/province: | Guizhou |
| Coordinates: | 26.9° North, 108.7° East (view map) | ||
| Paleocoordinates: | 14.8° North, 96.3° East | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | small collection |
Time
| Period: | Triassic | Epoch: | Middle Triassic |
| Stage: | Anisian | 10 m.y. bin: | Triassic 2 |
| Key time interval: | Anisian | ||
| Age range of interval: | 247.2 - 242 m.y. ago |
Stratigraphy
| Formation: | Qingyan | Member: | Leidapo | ||
| Stratigraphic resolution: | group of beds | ||||
| Stratigraphy comments: The Qingyan Formation is composed of limestones and mudstones and is about 800m thick. In ascending order, it is subdivided into the Xiaoshan, Mafengpo, Yingshangpo, Leidapo, and Yuqing members. According to palaeontological data, the latter two members are assigned to the upper Anisian, whereas the other three are regarded as lower Anisian in age. | |||||
Lithology and environment
| Primary lithology: | mudstone |
| Includes fossils? | Y |
| Lithology description: The Leidpo Member discussed in this paper, occupying the lower part of the upper Anisian, is about 200m thick and consists of mudstones, shales and marls. this member is characterized by fossiliferous mudstones and marls. It is grouped into three parts. The lower and upper parts are mainly composed of massive. laminated mudstone with abundant "paper shelled bivalves". The middle part consists of alternating beds of mudstone and marl. The Qingyan Formation is present in the northern part of the Middle Triassic Nanpanjiang Basin (or the Dian-Qian-Gui Basin), which was filled mainly with carbonate platform, bank and siliciclastic basinal deposits. the shallow-water carbonate platform is called the Yangtze Platform and was a stable palaeogeographic element from the Late Proterozoic to the Triassic. | |
| Environment: | marine indet. |
Taphonomy
| Size of fossils: | macrofossils |
Collection methods and comments
| Collection methods: | field collection |
| Reason for describing collection: | paleoecologic analysis |
Metadata
| Database number: | 42369 | ||
| Authorizer: | D. Bottjer | Enterer: | N. Bonuso |
| Modifier: | N. Bonuso | Research group: | marine invertebrate |
| Created: | 2004-07-28 11:57:42 | Last modified: | 2004-08-21 17:15:38 |
| Access level: | the public | Released: | 2004-07-28 11:57:42 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 11210. | T. Komatsu, J. Chen, M. Cao, F. Stiller, and H. Naruse. 2004. Middle Triassic (Anisian) diversified bivavles: depositional environments and bivalve assemblages in the Leidapo Member of the Qingyan Formation, southern China. Palaeogeography, Palaeoclimatology, Palaeoecology 208:207-223 [D. Bottjer/N. Bonuso/N. Bonuso] |