SW Richey Field-Williston Basin, Deadwood Fm., zone b (upper Tremadoc) ( of the United States)
Where: Montana (47.4° N, 105.6° W: paleocoordinates 10.3° S, 75.5° W)
• coordinate based on political unit
When: Deadwood Formation, Tremadoc (486.5 - 477.7 Ma)
• "Lower Ord., upper Tremadoc, Zone B"
Environment/lithology: lagoonal; lithology not reported
• "sh, ls and congl, muddy shelf lagoon (BA2) 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 275: 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
| Gastropoda | |
|
Plethospira sp. Ulrich and Scofield 1897 snail | |
| Lingulata | |
|
Schizambon sp. Walcott 1884 | |
|
Lingulepis sp. Hall 1863
Lingulella sp. Salter 1866 | |
| Strophomenata | |
|
Aporthophyla sp. Ulrich and Cooper 1938 | |
| Rhynchonellata | |
|
Tetralobula sp. Ulrich and Cooper 1936 | |
| Xiphosura | |
"Merostomata indet." = Xiphosura
"Merostomata indet." = Xiphosura Latreille 1802 | |
| Trilobita | |
|
Clelandia sp. Cossman 1902 trilobite | |
|
Praepatokephalus sp. Lochman 1964 trilobite | |
|
Bellefontia sp. Walcott 1924 trilobite
Xenostegium sp. Walcott 1924 trilobite | |
|
Symphysurina sp. Ulrich 1924 trilobite | |
|
Hystricurus sp. Raymond 1913 trilobite | |
| Pterobranchia | |
|
Dictyonema sp. Hall 1851 graptolite | |
| Conodonta | |
|
Drepanodus sp. Pander 1856 conodont | |