Northern Montezuma Range, Campito Fm., Nevadella zone, section MN-h 214-216: Montezuman, Nevada
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Trilobita
- Redlichiida
- Holmiidae
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Montezumaspis cometes
(Fritz 1995)
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Montezumaspis parallela
(Fritz 1995)
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original and current combination Palmettaspis parallela | |||||||
Palmettaspis lidensis
(Fritz 1995)
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1 specimen | ||||||
see common names |
Geography
Country: | United States | State/province: | Nevada | County: | Esmeralda |
Coordinates: | 37.7° North, 117.3° West (view map) | ||||
Paleocoordinates: | 3.5° South, 96.9° West | ||||
Basis of coordinate: | estimated from map | ||||
Geographic resolution: | outcrop |
Time
Period: | Cambrian | Epoch: | Early/Lower Cambrian |
10 m.y. bin: | Cambrian 2 | ||
Key time interval: | Montezuman | Zone: | Nevadella |
Age range of interval: | 530.00000 - 516.00000 m.y. ago |
Stratigraphy
Formation: | Campito | Member: | Montenegro | ||
Local section: | MN-h | Local bed: | 214-216 m | ||
Local order: | bottom to top | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: At the base of the middle Montezuman Stage. |
Lithology and environment
Primary lithology: | siltstone |
Secondary lithology: | sandstone |
Lithology description: siltstone and fine sandstone | |
Environment: | deep subtidal indet. |
Geology comments: Montenegro Member is 349 m thick. The lower 144 m is light brown sericitic siltstone and fine sandstone. The next 21 m interval contains silstone with quartzite and sandstone beds, and lenses of bioclastic carbonate packstone and glauconitic arenaceous limestone. The upper 184 m is greenish gray shaly siltstone with occasional lenses of fine sandstone. Near the top of the member there are thin beds of sandstone and bioclastic limestone.
Holmiid specimens comprise 60% of the trilobite fauna from 170 to 215 m in the composite Montezuma Range section (Fig. 5) increasing to 75% for the interval from 215 m to the top of the Montenegro, with nevadiids making up the rest of the trilobite fauna. This constitutes the holmiid-dominated biofacies which occurs in a relatively deep subtidal and dysaerobic mud bottom. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils,mesofossils |
Collection methods and comments
Reason for describing collection: | taxonomic analysis |
Metadata
Database number: | 140505 | ||
Authorizer: | W. Kiessling | Enterer: | M. Krause |
Modifier: | M. Krause | Research group: | marine invertebrate |
Created: | 2013-03-11 20:19:59 | Last modified: | 2013-03-13 05:23:19 |
Access level: | authorizer only | Released: | 2013-06-11 20:19:59 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
45528. | J. S. Hollingsworth. 2006. Holmiidae (Trilobita: Olenellina) of the Montezuman Stage (Early Cambrian) in Western Nevada. Journal of Paleontology 80(2):309-332 [W. Kiessling/M. Krause] |