Nyaiskii Fm., Igar region, Siberia ( of Russian Federation)

Where: Siberia, Russian Federation (68.0° N, 88.0° E: paleocoordinates 11.3° S, 14.0° E)

• local area-level geographic resolution

When: Nyaiskii Formation, Tremadoc (486.5 - 477.7 Ma)

• formation-level stratigraphic resolution

Environment/lithology: peritidal; lithified lime mudstone and dolomite

• algal laminated limestone interbedded with dolomite

Collection methods: JA: marked by Novack-Gottshall without explanation as omitting some genera, some macrofossils, some microfossils, and species names, but apparently complete

Primary reference: A. V. Rozova. 1968. Biostratigrafiya i trilobity verkhnego Kembriya i nizhnego Ordovika severo-zapada Sibirskoy Platformy [Biostratigraphy and trilobites of the Upper Cambrian and Lower Ordovician of the northwestern Siberian platform]. Trudy Instituta Geologii i Geofiziki, Sibirskoye Otdeleniye 36:1-195 [A. Miller/P. Novack-Gottshall/U. Merkel]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 9283: authorized by Arnold Miller, entered by Phil Novack-Gottshall on 12.10.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

• Primarily trilobite biostrat.
Trilobita
 Olenida - Eulomidae
Loparella sp. Rozova 1968 trilobite
Pseudoacrocephalites sp. Maksimova 1962 trilobite
Lopeuloma sp. Rozova 1968 trilobite
 Ptychopariida - Acrocephalitidae
Diceratocephalina sp. Maksimova 1962 trilobite
 Ptychopariida - Plethopeltidae
Plethopeltoides sp. Khramova 1968 trilobite
Rhynchonellata
 Orthida - Plectorthidae
? Nanorthis sp. Ulrich and Cooper 1936
 Pentamerida - Tetralobulidae
Tetralobula sp. Ulrich and Cooper 1936
Pterobranchia
 Dendroidea - Acanthograptidae
Callograptus sp. graptolite
Dictyonema sp. Hall 1851 graptolite