USGS 10632-CO Shublik Mountains section 87NA-1: Ashgill, Alaska

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Conodonta - Prioniodontida
Aphelognathus sp.
Conodonta - Panderodontida - Panderodontidae
Panderodus sp. Ethington 1959
Pseudobelodina cf. adentata
Pseudobelodina aff. vulgaris Sweet 1979
Conodonta - Protopanderodontida - Drepanoistodontidae
Drepanoistodus suberectus (Branson and Mehl 1933)
Bivalvia
Bivalvia indet. Linnaeus 1758
Gastropoda - Euomphalina - Macluritidae
Maclurites cf. manitobensis (Whiteaves 1890)
recombined as Maclurina manitobensis
Gastropoda - Euomphalina - Euomphalidae
Siskiyouspira sp. Rohr 1980
Gastropoda - Murchisoniina - Murchisoniidae
? Murchisonia sp. d'Archiac and de Verneuil 1841
Gastropoda - Murchisoniina - Lophospiridae
Ectomaria cf. prisca (Billings 1859)
Cephalopoda
Cephalopoda indet. Cuvier 1797
Rhynchonellata - Pentamerida - Virgianidae
Tscherskidium sp. ()
original and current combination Tcherskidium
Ostracoda
Ostracoda indet. Latreille 1802
Ostracoda - Leperditicopida - Leperditiidae
Sibiritia sp. Abushik 1958
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]