Mayilashan Group, Lower Part, Near Karamay City, NW Xinjiang Province: Ludlow, China
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
Pterobranchia
- Graptoloidea
- Monograptidae
|
|||||||
|
Pristiograptus cf. colonnus
|
|||||||
|
Saetograptus cf. chimaera
|
|||||||
| see common names | |||||||
Geography
| Country: | China | State/province: | Xinjiang |
| Coordinates: | 45.5° North, 84.9° East (view map) | ||
| Paleocoordinates: | 1.3° South, 71.0° East | ||
| Basis of coordinate: | based on nearby landmark | ||
| Geographic resolution: | local area |
Time
| Period: | Silurian | Epoch: | Ludlow |
| 10 m.y. bin: | Silurian 2 | ||
| Key time interval: | Ludlow | ||
| Age range of interval: | 427.40000 - 423.00000 m.y. ago |
Stratigraphy
| Geological group: | Mayilashan | ||||
| Stratigraphic resolution: | group | ||||
| Stratigraphy comments: Except where otherwise stated, ref. 7624 uses Lower Silurian as equivalent to Llandovery, Middle Silurian as equivalent to Wenlock, and Upper Silurian as equivalent to Ludlow plus Pridoli. | |||||
Lithology and environment
| Primary lithology: | volcaniclastic,gray,green,red or brown "siliciclastic" |
| Secondary lithology: | tuffaceous siltstone |
| Lithology description: "The [group] consists mainly of gray-green and purple volcanoclastic rocks, intermediate and basic lavas, clastic rocks (tuffaceous siltstone), siliceous slate, and argillaceous siltstone. There is also intercalated sandstone, conglomerate, andesite porphyry, basalt, and basanite. Fossils, usually corals, brachiopods, and graptolites, occur in both the upper and lower parts...A thickness of 8438 m is mentioned." | |
| Environment: | marine indet. |
| Geology comments: Correlation chart indicates BA3 based shelly fauna, at least for upper part of the Group. | |
Taphonomy
Collection methods and comments
| Reason for describing collection: | biostratigraphic analysis |
Metadata
| Database number: | 27794 | ||
| Authorizer: | M. Foote | Enterer: | M. Foote |
| Modifier: | M. Foote | Research group: | marine invertebrate |
| Created: | 2003-01-09 11:22:25 | Last modified: | 2006-09-13 14:01:03 |
| Access level: | the public | Released: | 2003-01-09 11:22:25 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 7624. | E.-z. Mu, A. J. Boucot, X. Chen and J.-y. Rong. 1986. Correlation of the Silurian rocks of China. In A. J. Boucot and W. B. N. Berry (eds.), Geological Society of America Special Paper 202:1-80 [M. Foote/M. Foote/P. Wagner] |