Above Montezuman/Dyeran proposed stratotype, Nevada - Hollingsworth 1999: Dyeran, Nevada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
|
unclassified
|
||||||||||
|
Hyolithia indet.
|
||||||||||
| probably orthothecid | ||||||||||
|
Obolellata
- Obolellida
- Obolellidae
|
||||||||||
|
Obolella sp.
Billings 1861
|
||||||||||
|
Trilobita
|
||||||||||
|
Trilobita indet.
Walch 1771
|
||||||||||
| Species wanneriid with undescribed new genus | ||||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Nevada | County: | Esmeralda |
| Coordinates: | 37.8° North, 117.3° West (view map) | ||||
| Paleocoordinates: | 1.3° South, 94.8° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cambrian | Epoch: | Series 2 |
| 10 m.y. bin: | Cambrian 2-3 | ||
| *Period: | Early/Lower Cambrian - Middle Cambrian | *Epoch: | Caerfai |
| *International age/stage: | Late/Upper Atdabanian | *Local age/stage: | Dyeran |
| Key time interval: | Dyeran | ||
| Age range of interval: | 514.8 - 511 m.y. ago | ||
| * legacy (obsolete) database fields | |||
Stratigraphy
Lithology and environment
| Primary lithology: | hummocky CS,flute casts,gray lithified calcareous siltstone |
| Secondary lithology: | shelly/skeletal lithified "limestone" |
| Includes fossils? | Y |
| Lithology description: light olive gray shaly siltstone with beds of laminated fine sandstone (5-35%), sometimes calcareous and occasionally occurring in hummocky crossbedded lenses and gutter casts. Cream colored bioclastic limestone in 1-7cm thick layers and occassionally as gutter fillings, make up 5-40% of the interval. Many of the bioclastic layers contain tubular fossils. | |
Taphonomy
| Modes of preservation: | body,trace |
| Disassociated major elements: | some |
| Disassociated minor elements: | many |
Collection methods and comments
| Collection methods: | bulk,field collection |
| Reason for describing collection: | biostratigraphic analysis |
| Collection method comments: Most of the trilobites are found as broken sclerites in thin bioclastic limestone, but intact cephala are occasionally found in the shaly siltstone. | |
Metadata
| Database number: | 10497 | ||
| Authorizer: | M. Patzkowsky | Enterer: | P. Borkow |
| Modifier: | C. Visaggi | Research group: | marine invertebrate |
| Created: | 2001-05-11 12:42:52 | Last modified: | 2004-07-07 20:29:21 |
| Access level: | the public | Released: | 2001-05-11 12:42:52 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 3887. | J. S. Hollingsworth. 1999. Proposed stratotype section and point for the base of the Dyeran Stage. Laurentai 99: V field conference of the Cambrian Stage and Subdivision 38-42 [M. Patzkowsky/P. Borkow] |