USGS 3748-CO, northeast of Gold Point: Dyeran, Nevada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
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unclassified
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Porifera informal indet. 1
Grant 1836
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5 elements | |||||||||
| Sponge spicule type 1 | ||||||||||
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Porifera informal indet. 2
Grant 1836
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5 elements | |||||||||
| Sponge spicule type 2 | ||||||||||
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Echinodermata indet.
Klein 1754
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16 elements | |||||||||
| Echinoderm sclerites | ||||||||||
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Lingulata
- Lingulida
- Kyrshabaktellidae
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Kyrshabaktella sp.
Koneva 1986
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30 specimens | |||||||||
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Lingulata
- Lingulida
- Acrothelidae
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? Eothele spurri
(Walcott 1908)
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1 specimen | |||||||||
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Lingulata
- Acrotretida
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? Hadrotreta primaea
(Walcott 1902)
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6 specimens | |||||||||
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Polychaeta
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Sphenothallus sp.
Hall 1847
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16 fragments | |||||||||
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Trilobita
- Redlichiida
- Olenellidae
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Paedeumias granulatus n. sp.
Palmer 1964
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Palmer 1964 | |||||||||
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Trilobita
- Redlichiida
- Wanneriidae
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Wanneria cf. walcottana
(Wanner 1901)
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Palmer 1964 | |||||||||
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Trilobita
- Corynexochida
- Dorypygidae
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Ogygopsis batis
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Palmer 1964 | |||||||||
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Bonnia caperata n. sp.
Palmer 1964
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Palmer 1964 | |||||||||
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Olenoides sp.
Meek 1877
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Palmer 1964 | |||||||||
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Trilobita
- Corynexochida
- Oryctocephalidae
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Goldfieldia pacifica n. gen., n. sp.
Palmer 1964
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Palmer 1964 | |||||||||
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Trilobita
- Corynexochida
- Zacanthoididae
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? Stephenaspis avitus n. sp.
Palmer 1964
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Palmer 1964 | |||||||||
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Zacanthopsis contractus n. sp.
Palmer 1964
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Palmer 1964 | |||||||||
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Zacanthopsina eperephes n. gen., n. sp.
Palmer 1964
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Palmer 1964 | |||||||||
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Trilobita
- Ptychopariida
- Ptychopariidae
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? Syspacephalus sp.
Resser 1936
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Palmer 1964 | |||||||||
| synonym of Ptychoparella | ||||||||||
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Hyolithelminthida
- Hyolithellidae
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Hyolithellus insolitus
Voronin et al. 1982
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37 fragments | |||||||||
| see common names | ||||||||||
Geography
| Country: | United States | State/province: | Nevada | County: | Esmeralda |
| Coordinates: | 37.4° North, 117.4° West (view map) | ||||
| Paleocoordinates: | 1.2° South, 95.3° West | ||||
| Basis of coordinate: | based on nearby landmark | ||||
| Geographic resolution: | outcrop |
Time
| Period: | Cambrian | Epoch: | Series 2 |
| 10 m.y. bin: | Cambrian 2-3 | ||
| Key time interval: | Dyeran | Trilobite zone: | Arcuolenellus arcuatus |
| Age range of interval: | 514.80000 - 511.00000 m.y. ago |
Stratigraphy
| Formation: | Harkless | ||||
| Stratigraphic resolution: | formation | ||||
| Stratigraphy comments: The macrofauna described by Palmer (1964) includes olenellids, oryctocephalids and trilobite genera such as Bonnia and Zacanthopsis, clearly indicating a late Early Cambrian age (Dyeran Stage, or Bonnia-Olenellus Zone; Palmer 1998). The presence of younger Early Cambrian trilobite assemblages (including Bristolia) in the overlying Mule Springs and basal Emigrant Formations (Palmer 1964; Sundberg & McCollum 2003) indicate that the age of the assemblage may be attributable to the lower or middle parts of the Dyeran stage. PJW: This would probably be the Arcuolenellus arcuatus subzone. | |||||
Lithology and environment
| Primary lithology: | lithified calcareous sandstone | ||
| Secondary lithology: | lithified sandy "limestone" | ||
| Includes fossils? | Y | ||
| Includes fossils? | Y | ||
| Lithology description: The material described herein was collected from sandy limestones and carbonate cemented sandstones in the upper Harkless Formation (attributed to the Saline Valley Formation; Palmer 1964), about 12 meters above a prominent sandstone unit. The upper part of the Harkless Formation in Esmeralda County is difficult to correlate with coeval sections further to the south in the Great Basin, but is probably laterally continuous with the Saline Valley Formation, as recognised in northern Inyo County, California (Palmer 1971; Hollingsworth pers. com. 2005). | |||
| Environment: | carbonate indet. | Tectonic setting: | passive margin |
| Geology comments: All originally phosphatic shells present in the Harkless Formation assemblage have been subjected to the activity of boring micro-organisms. Traces of perforations are present on many shell surfaces (e.g. Figs. 2A, 6A, 6E, 6J), and many specimens are broken along zones of weakness induced by the borings. Similar micro-borings in Cambrian shells have been attributed to cyanobacteria (e.g. Runnegar in Bengtson et al. 1990; Stockfors & Peel 2005). | |||
Taphonomy
| Modes of preservation: | body,cast,replaced with calcite,replaced with phosphate |
| Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
| Collection excludes: | some macrofossils |
| Collection methods: | field collection |
| Reason for describing collection: | taxonomic analysis |
| Museum repositories: | USNM |
| Taxonomic list comments:See Palmer (1964) for trilobites, etc. | |
Metadata
| Database number: | 96417 | ||
| Authorizer: | P. Wagner, M. Hopkins | Enterer: | P. Wagner, M. Hopkins |
| Modifier: | P. Wagner | Research group: | marine invertebrate |
| Created: | 2010-06-07 07:25:02 | Last modified: | 2021-09-06 13:21:33 |
| Access level: | the public | Released: | 2010-06-07 07:25:02 |
| Creative Commons license: | CC BY |
Reference information
Primary reference:
| 32726. | C. B. Skovsted and L. E. Holmer. 2006. The Lower Cambrian brachiopod Kyrshabaktella and associated shelly fossils from the Harkless Formation, southern Nevada. Geologiska Föreningens i Stockholm Förhandlingar 128(4):327-337 [P. Wagner/P. Wagner] |
Secondary references:
| 36803 | A. R. Palmer. 1964. An unusual Lower Cambrian trilobite fauna from Nevada. United States Geological Survey Professional Paper 483-F:F1-F12 [M. Hopkins/M. Hopkins] |