Lower Member, Guojaba Formation, Shaanxi, China - Conway Morris and Menge 1990: Atdabanian, China
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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Tommotiida
- Tannuolinidae
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Tannuolina zhangwentangi
Qian and Bengtson 1989
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| see common names | |||||||
Geography
| Country: | China | County: | Shaanxi |
| Coordinates: | 36.9° North, 109.3° East (view map) | ||
| Paleocoordinates: | 3.6° South, 144.4° East | ||
| Basis of coordinate: | based on political unit | ||
| Geographic resolution: | outcrop |
Time
| Period: | Cambrian | Epoch: | Series 2 |
| Stage: | Stage 3 | 10 m.y. bin: | Cambrian 2 |
| *Period: | Early/Lower Cambrian | *Epoch: | Middle Caerfai |
| *International age/stage: | Atdabanian | ||
| Key time interval: | Atdabanian | ||
| Age range of interval: | 521 - 515.6 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
| Formation: | Guojiaba | Member: | Lower |
| Local section: | Xuanjiangping | Local bed: | 2 horizons approximately 425 m above base of Precambrian - Cambrian boundary |
| Stratigraphic resolution: | group of beds |
Lithology and environment
| Primary lithology: | pebbly lithified "limestone" |
| Lithology description: the lower horizon consists of nodular limestone and the overlying horizon is more even bedded limestone | |
Taphonomy
| Modes of preservation: | cast |
Collection methods and comments
| Collection methods: | chemical,mechanical,peel or thin section,field collection |
| Reason for describing collection: | taxonomic analysis |
| Collection method comments: Specimens collected during a Royal Society-Academia Sinica Exchange Sheme. | |
Metadata
| Database number: | 8333 | ||
| Authorizer: | M. Patzkowsky | Enterer: | P. Borkow |
| Modifier: | C. Visaggi | Research group: | marine invertebrate |
| Created: | 2000-07-06 22:45:57 | Last modified: | 2004-03-11 16:25:05 |
| Access level: | the public | Released: | 2001-03-27 12:03:00 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 572. | S. Conway Morris and M. Chen. 1990. Tommotiids from the Lower Cambrian of South China. Journal of Paleontology 64(2):169-184 [M. Patzkowsky/P. Borkow/P. Wagner] |