Williston Basin, Deadwood Fm., Arenig, zone e: Arenig, Montana

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
Dentinella sp.
Pterobranchia - Dendroidea - Dendrograptidae
Dendrograptus sp. Hall 1858
Ptilograptus sp.
Pterobranchia - Dendroidea - Acanthograptidae
Callograptus sp.
Dictyonema sp. Hall 1851
Pterobranchia - Graptoloidea - Mastigograptidae
Mastigograptus sp. Ruedemann 1908
Pterobranchia - Graptoloidea - Dichograptidae
Clonograptus sp. Nicholson 1873
Eocrinoidea
Eocrinoidea indet. Jaekel 1918
Conodonta - Protopanderodontida - Protopanderodontidae
Scolopodus sp.
Drepanodus sp. Pander 1856
Conodonta - Prioniodontida - Distomodontidae
Distomodus sp. Branson and Branson 1947
originally entered as "Distocodus sp."
Rhynchonellata - Orthida - Plectorthidae
Nanorthis sp. Ulrich and Cooper 1936
Rhynchonellata - Pentamerida - Clarkellidae
Syntrophina sp.
Diaphelasma sp.
Lingulata - Lingulida - Obolidae
Lingulella sp. Salter 1866
Lingulata - Acrotretida - Acrotretidae
Acrotreta sp. Kutorga 1848
Gastropoda - Sinuopeidae
Rhombella sp. Bridge and Cloud 1947
synonym of Euconia
Schizopea sp. Butts 1926
Gastropoda - Euomphalina - Macluritidae
Macluritella sp. Kirk 1927
originally entered as "Lyrtospira sp."
Gastropoda - Euomphalina - Raphistomatidae
Ceratopea sp. Ulrich 1911
originally Raphistomina
Gastropoda - Euomphalina - Ophiletidae
Lecanospira sp. Butts 1926
Gastropoda - Murchisoniina - Hormotomidae
Hormotoma sp. (Salter 1859)
originally Murchisonia
Gastropoda - Bellerophontida - Bucanellidae
Bucanella sp. Meek 1871
Gastropoda - Bellerophontida - Tropidodiscidae
Tropidodiscus sp. Meek and Worthen 1866
Trilobita - Corynexochida - Leiostegiidae
Lloydia sp. Vogdes 1893
Trilobita - Asaphida
Asaphida indet. Salter 1864
Trilobita - Proetida - Hystricuridae
Hystricurus sp. Raymond 1913
Trilobita
Pseudoclelanida sp. (Ross 1951)
original and current combination Pseudoclelandia
originally entered as "Pseudoclelandia sp."
Scyphozoa - Conulariida - Conulariidae
Conularia sp.
see common names

Geography
Country:United States State/province:Montana
Coordinates: 47.4° North, 105.6° West (view map)
Paleocoordinates:10.4° South, 71.9° West
Basis of coordinate:based on political unit
Time
Period:Ordovician
10 m.y. bin:Ordovician 2
*Period:Early/Lower Ordovician *Epoch:Arenig
Key time interval:Arenig
Age range of interval:477.70000 - 468.40000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Formation:Deadwood
Stratigraphy comments: "lower ord., middle? Arenig"
Lithology and environment
Primary lithology: not reported
Environment:lagoonal Tectonic setting:passive margin
Geology comments: "sh, ls, and congl. muddy shelf lagoon (BA2) cratonic shelf"
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:biostratigraphic analysis
Taxonomic list comments:"Lochman-Balk and Wilson 1967. biostrat. lists."
Metadata
Database number:286
Authorizer:J. Sepkoski Enterer:M. Sommers
Modifier:J. Ju Research group:marine invertebrate
Created:1998-11-20 10:07:18 Last modified:2017-01-04 17:03:39
Access level:the public Released:1998-11-20 10:07:18
Creative Commons license:CC BY
Reference information

Primary reference:
60989. C. Lochman-Balk and J. L. Wilson. 1967. Stratigraphy of Upper Cambrian-Lower Ordovician Subsurface Sequence in Williston Basin. AAPG Bulletin 51(6):883-917 [M. Uhen/J. Ju]