Peraspis fauna, Road River Fm., Llanvirn (Ordovician of Canada)

Where: Yukon, Canada (62.8° N, 136.6° W: paleocoordinates 17.2° N, 76.5° W)

• coordinate based on political unit

When: Road River Formation, Llanvirn (466.0 - 460.9 Ma)

Environment/lithology: slope; black, argillaceous lime mudstone

• "black argillaceous lime mudstone and shales"

Size class: macrofossils

Primary reference: R. Ludvigsen. 1981. Biostratigraphy significance of Middle Ordovician trilobites from the Road River Formation, northern Cordillera. Geological Association of Canada Abstracts 6:A-36 [M. Uhen/J. Ju/J. Ju]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 302: authorized by Jack Sepkoski, entered by Mike Sommers on 20.11.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• "R.Ludvigsen 1981. Biostrat. significance of M.Ord. trilobites from the Road River Fm., northern Cordillera. Geol.Assoc.Canada Abstracts 6:A-36." [trilobites only, 1 brach]
Rhynchonellata
 Orthida -
Orthida indet. Schuchert and Cooper 1932
Inarticulata
  -
Trilobita
 Trinucleida - Raphiophoridae
Globampyx sp. Fortey 1975 trilobite
 Asaphida - Nileidae
Peraspis sp. Whittington 1965 trilobite
Nileus sp. Dalman 1827 trilobite
 Asaphida - Asaphidae
Niobe sp. Angelin 1851 trilobite
 Asaphida - Remopleurididae
Blosyropsis sp. Whittington 1965 trilobite
 Corynexochida - Illaenidae
Illaenus sp. Dalman 1827 trilobite
 Phacopida - Encrinuridae
Cybelurus sp. Levitsky 1962 trilobite
 Phacopida - Calymenidae
Protocalymene sp. Ross and Barnes 1967 trilobite
Artiopoda
 Agnostida - Metagnostidae
Arthrorhachis sp. Hawle and Corda 1847
originally entered as "Arthrorachis sp."