Swan Peak Fm., Llanvirn, zone m (Ordovician of the United States)

Where: Utah (40.2° N, 110.4° W: paleocoordinates 9.9° S, 77.7° W)

• coordinate based on political unit

When: Didymograptus artus graptolite zone, Shale Member (Swan Peak Formation), Whiterockian (470.0 - 457.3 Ma)

• "Llanvirn (Whiterockian),(shale member)" Zone M.

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; black shale

• "interbedded black sh and qtzite"

Size class: macrofossils

Primary reference: R. J., J.r. Ross. 1949. Stratigraphy and trilobite faunal zones of the Garden City Formation, northeastern Utah. American Journal of Science 247(7):472-491 [M. Uhen/J. Ju/P. Wagner]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 298: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998, edited by Pete Wagner

Creative Commons license: CC BY (attribution)

Taxonomic list

• "Ross 1949"
Show authors, comments, and common names
Pterobranchia
 Graptoloidea - Dichograptidae
"Didymograptus artus" = Didymograptus (Didymograptus) artus
"Didymograptus artus" = Didymograptus (Didymograptus) artus Elles and Wood 1901 graptolite
 Graptoloidea - Pterograptidae
Yutagraptus mantuanus
Yutagraptus mantuanus graptolite
NOTE: This is not Didymograptus bifidus
Rhynchonellata
 Orthida - Orthidae
Orthis sp.
Orthis sp. Dalman 1828
2 species
 Orthida - Anomalorthidae
Anomalorthis sp.
Anomalorthis sp. Ulrich and Cooper 1936
Trilobita
 Asaphida - Nileidae
? Symphysurus sp.
? Symphysurus sp. Goldfuss 1843 trilobite
originally entered as "? Symphysurus sp."
 Proetida - Bathyuridae
Bathyurellus pogonipensis, Eleutherocentrus petersoni
Bathyurellus pogonipensis Hintze 1953 trilobite
Eleutherocentrus petersoni Clark 1935 trilobite
originally entered as "Eleatherocentrus petersoni"
Ostracoda
 Leperditicopida - Leperditiidae
Leperditia sp.
Leperditia sp. Rouault 1851 ostracod