Leidapo ML-17-18: Middle Triassic, China
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Bivalvia
- Nuculida
- Nuculidae
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Palaeonucula qingyanensis
Chen 1976
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Bivalvia
- Carditida
- Myophoricardiidae
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Myophoricardium lineatum
von Wöhrmann 1889
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Bivalvia
- Lucinida
- Lucinidae
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Schafhaeutlia astarteformis
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Schafhaeutlia mellingi
(Hauer 1857)
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Schafhaeutlia laubei
(Bittner 1895)
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Bivalvia
- Trigoniida
- Myophoriidae
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Neoschizodus cf. laevigatus
(Ziethen 1830)
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Costatoria multiformis
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| Costatoria prohara multiformis | ||||||||||
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Costatoria inaequicostata
(Klipstein 1843)
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Quadratia quadrata
Yin 1974
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Elegantinia kunlunensis
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Elegantinia elegans
(Dunker 1849)
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Elegantinia cf. venusta
Chen 1976
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Bivalvia
- Pterioida
- Prospondylidea
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Enantiostreon difformis
(Schlotheim 1820)
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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 qingyanensis
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Cassianella gyrphaeatoides
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Cassianella simplex
Chen 1976
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Bivalvia
- Ostreida
- Bakevelliidae
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Cultriopsis angusta
(Munster 1838)
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Gervillaria subelegans
(Chen 1976)
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Bivalvia
- Ostreida
- Pteriidae
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Pteria rugosa
Chen 1976
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Pteria cf. sturi
(Bittner 1895)
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Bivalvia
- Pectinida
- Dimyidae
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Protostrea sinensis
(Hsu 1943)
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Bivalvia
- Pectinida
- Hunanopectinidae
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Leptochondria paradoxica
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Leptochondria subillyrica
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Bivalvia
- Pectinida
- Pectinidae
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Pleuronectites cf. laevigatus
Schlotheim 1820
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Praechlamys schroeteri
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Bivalvia
- Pectinida
- Entoliidae
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Entolium sp.
(Meek 1865)
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Bivalvia
- Myalinida
- Mysidiellidae
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Mytilus praecursor
Renz 1904
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| Mytilus eduliformis praecursor | ||||||||||
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Bivalvia
- Cyrtodontida
- Pichleriidae
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Elegantarca subareata
Chen 1976
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Bivalvia
- Arcida
- Parallelodontidae
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Parallelodon esiensis
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Bivalvia
- Mytilida
- Mytilidae
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Modiolus dimidiatus
(Münster 1841)
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Modiolus paronai
(Bittner 1895)
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| see common names | ||||||||||
Geography
| Country: | China | State/province: | Guizhou |
| Coordinates: | 26.9° North, 108.7° East (view map) | ||
| Paleocoordinates: | 17.3° North, 96.3° East | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | small collection |
Time
| Period: | Triassic | Epoch: | Middle Triassic |
| 10 m.y. bin: | Triassic 2 | ||
| Key time interval: | Middle Triassic | ||
| Age range of interval: | 247.2 - 237 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: | 42278 | ||
| Authorizer: | D. Bottjer | Enterer: | N. Bonuso |
| Modifier: | N. Bonuso | Research group: | marine invertebrate |
| Created: | 2004-07-27 10:40:03 | Last modified: | 2004-07-27 13:53:18 |
| Access level: | the public | Released: | 2004-07-27 10:40:03 |
| 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] |