USGS 10632-CO Shublik Mountains section 87NA-1: Ashgill, Alaska
List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Conodonta
- Prioniodontida
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Aphelognathus sp.
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Conodonta
- Panderodontida
- Panderodontidae
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Panderodus sp.
Ethington 1959
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Pseudobelodina cf. adentata
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Pseudobelodina aff. vulgaris
Sweet 1979
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Conodonta
- Protopanderodontida
- Drepanoistodontidae
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Drepanoistodus suberectus
(Branson and Mehl 1933)
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Bivalvia
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Bivalvia indet.
Linnaeus 1758
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Gastropoda
- Euomphalina
- Macluritidae
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Maclurites cf. manitobensis
(Whiteaves 1890)
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recombined as Maclurina manitobensis | |||||||
Gastropoda
- Euomphalina
- Euomphalidae
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Siskiyouspira sp.
Rohr 1980
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Gastropoda
- Murchisoniina
- Murchisoniidae
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? Murchisonia sp.
d'Archiac and de Verneuil 1841
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Gastropoda
- Murchisoniina
- Lophospiridae
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Ectomaria cf. prisca
(Billings 1859)
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Cephalopoda
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Cephalopoda indet.
Cuvier 1797
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Rhynchonellata
- Pentamerida
- Virgianidae
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Tscherskidium sp.
()
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original and current combination Tcherskidium | |||||||
Ostracoda
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Ostracoda indet.
Latreille 1802
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Ostracoda
- Leperditicopida
- Leperditiidae
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Sibiritia sp.
Abushik 1958
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see common names |
Geography
Country: | United States | State/province: | Alaska |
Coordinates: | 69.5° North, 145.6° West (view map) | ||
Paleocoordinates: | 14.4° North, 45.9° West | ||
Basis of coordinate: | estimated from map |
Time
Period: | Ordovician | Epoch: | Late/Upper Ordovician |
10 m.y. bin: | Ordovician 5 | ||
Key time interval: | Ashgill | Conodont zone: | Aphelognathus divergens |
Age range of interval: | 449.60000 - 443.80000 m.y. ago |
Stratigraphy
Formation: | Nanook | Member: | 7 | ||
Local section: | section 87NA-1 | Local bed: | 11.0 - 11.3 m | ||
Local order: | bottom to top | ||||
Stratigraphic resolution: | bed | ||||
Stratigraphy comments: 11.0 to 11.3 m above base of section. Probably Richmondian given divergens. Originally entered as Member 8, but that is the Devonian ; Member 7 is inferred. |
Lithology and environment
Primary lithology: | lithified "limestone" |
Environment: | lagoonal/restricted shallow subtidal |
Geology comments: Warm, possibly very shallow water depositional environment. |
Taphonomy
Modes of preservation: | body |
Size of fossils: | macrofossils,microfossils |
Collection methods and comments
Reason for describing collection: | general faunal/floral analysis |
Taxonomic list comments:Identified by A.G. Harris and D. Rohr. |
Metadata
Database number: | 113018 | ||
Authorizer: | A. Miller | Enterer: | S. Kolbe |
Modifier: | P. Wagner | Research group: | marine invertebrate |
Created: | 2011-07-19 06:38:17 | Last modified: | 2024-03-31 19:20:45 |
Access level: | the public | Released: | 2011-07-19 06:38:17 |
Creative Commons license: | CC BY |
Reference information
Primary reference:
36729. | R. B. Blodgett, D. M. Rohr, A. G. Harris and R. Jia-yu. 1987. A major unconformity between Upper Ordovician and Lower Devonian strata in the Nanook Limestone, Shublik Mountains, northeastern Brooks Range. United States Geological Survey Circular 1016:18-23 [A. Miller/S. Kolbe] |