SW Richey Field, Deadwood Fm., Saukia Zone (Cambrian of the United States)

Where: Montana (47.4° N, 105.6° W: paleocoordinates 10.9° S, 85.8° W)

• coordinate based on political unit

When: Saukia zone, Deadwood Formation, Cambrian (538.8 - 485.4 Ma)

• "Trempealeau"

Environment/lithology: lagoonal; lithology not reported

• "sh., ls, and congl. muddy shelf lagoon, cratonic shelf"

Size class: macrofossils

Primary reference: 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]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 258: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Lochman-Balk and Wilson, 1967. Biostrat. lists."
Show authors, comments, and common names
Pterobranchia
 Dendroidea - Dendrograptidae
Dendrograptus sp.
Dendrograptus sp. Hall 1858 graptolite
 Dendroidea - Acanthograptidae
Acanthograptus sp.
Lingulata
 Siphonotretida - Siphonotretidae
Schizambon sp.
Schizambon sp. Walcott 1884
 Lingulida - Obolidae
Lingulella sp., Obolus sp.
Lingulella sp. Salter 1866
Obolus sp. Eichwald 1829
 Acrotretida - Acrotretidae
Acrotreta sp.
Acrotreta sp. Kutorga 1848
Rhynchonellata
 Orthida - Eoorthidae
Apheoorthis sp.
Apheoorthis sp. Ulrich and Cooper 1936
Trilobita
 Asaphida - Ptychaspididae
"Macronoda sp." = Macronoda, "Promesus sp." = Macronoda
"Macronoda sp." = Macronoda Lochmann 1964 trilobite
"Promesus sp." = Macronoda Lochmann 1964 trilobite
 Asaphida - Dikelocephalidae
Monocheilus sp., Dikelocephalus sp., Saukia sp.
Monocheilus sp. Resser 1937 trilobite
Dikelocephalus sp. Owen 1852 trilobite
Saukia sp. Walcott 1914 trilobite
 Ptychopariida - Plethopeltidae
"Plethometopus sp." = Plethopeltis
"Plethometopus sp." = Plethopeltis Raymond 1913 trilobite
Artiopoda
 Agnostida - Diplagnostidae
Pseudagnostus sp.
Pseudagnostus sp. Jaekel 1909
 Agnostida - Metagnostidae
Geragnostus sp.
Geragnostus sp. Howell 1935