Xianfeng, Xundian - [Zhongyicun Mbr, Yuhucun Fm]: Nemakit-Daldynian, China
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Helcionelloida
- Helcionellidae
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| Feng et al. 2000 | |||||||
| see common names | |||||||
Geography
| Country: | China | State/province: | Yunnan |
| Coordinates: | 24.6° North, 103.1° East (view map) | ||
| Paleocoordinates: | 22.1° North, 60.2° East (Wright 2013) | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | small collection |
Time
| Period: | Cambrian | Epoch: | Terreneuvian |
| 10 m.y. bin: | Cambrian 1-2 | ||
| Key time interval: | Nemakit-Daldynian | ||
| Age range of interval: | 538.8 - 525.5 m.y. ago |
Stratigraphy
| Formation: | Zhujiaqing | Member: | Zhongyicun | ||
| Stratigraphic resolution: | bed | ||||
| Stratigraphy comments: LITHOSTRATIGRAPHIC RELATIONS: From the Zhongyicun Mbr of the Zhujiaqing Fm. AGE: Meischucunian stage in Feng et al (2001); placed here in Nemakit-Daldynian according to Steiner et al. (2007) based on correlation of Zhongyicun Mbr to lower Meischucunian= Nemakit-Daldynian. STRATIGRAPHIC POSITION: From upper phosphatic bed (Feng et al., 2001). | |||||
Lithology and environment
| Primary lithology: | lithified phosphorite |
| Includes fossils? | Y |
| Lithology description: LITHOLOGY: Phosphorite. LITHIFICATION: Lithified on the basis of facies and sample preparation. | |
| Environment: | marine indet. |
| Geology comments: ENVIRONMENT: Not stated in text. | |
Taphonomy
| Modes of preservation: | body,replaced with phosphate |
| Size of fossils: | mesofossils,microfossils |
| Preservation of anatomical detail: | excellent |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | bulk,field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | NIGPAS |
| Collection method comments: COLLECTOR: Not stated in text. REPOSITORY: Nanjing Instutute of Paleontology and Geology (NIPG). | |
| Taxonomic list comments:COVERAGE: Not an exhaustive fauna list; derived from publication with limited taxonomic scope. NOMENCLATURE: Authoritative publication, with modern nomenclature and species-resolution identifications. | |
Metadata
| Database number: | 87095 | ||
| Authorizer: | A. Hendy, P. Wagner | Enterer: | A. Hendy, P. Wagner |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Subset of collection #: | 50465 | ||
| Created: | 2009-03-03 20:13:06 | Last modified: | 2025-02-22 15:12:02 |
| Access level: | the public | Released: | 2009-03-03 20:13:06 |
| Creative Commons license: | CC0 |
Reference information
Primary reference:
| 15906. | W. M. Feng, W. G. Sun, and Y. Qian. 2001. Skeletalization characters, classification and evolutionary significance of Early Cambrian Monoplacophoran maikhanellids. Acta Palaeontologica Sinica 40:195-213 [P. Wagner/P. Wagner/P. Wagner] |
Secondary references:
| 15905 | W. M. Feng, W. G. Sun, and Y. Qian. 2000. Earliest Cambrian monoplacophora in northeastern Yunnan with some new genera and species. Acta Micropalaeontologica Sinica 17:365-377 [P. Wagner/P. Wagner/A. Hendy] | |
| 10963 | G.P. Wahlman. 1992. Middle and Upper Ordovician symmetrical univalved mollusks (Monoplacophora and Bellerophontina) of the Cincinnati Arch region. United States Geological Survey Professional Paper 1066(O):1-123 [P. Wagner/P. Wagner/E. Ito] |