Mikhailovskii Mine, Zheleznogorsk (Devonian of Russian Federation)

Where: Russian Federation (52.3° N, 35.4° E: paleocoordinates 7.9° S, 18.0° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Early/Lower Frasnian (383.7 - 382.4 Ma)

• STRATIGRAPHIC RELATIONS: No lithostratigraphic data reported; Utekhin (1972) assigned the bone beds to the Lower Shchigry Subformation, which is presently referred to the nonstratified Pashi and Kyn (Timan) horizons.. AGE: Lower Frasnian, upper Timan regional stage; since no conodonts or invertebrates occurred in the Devonian beds, they were dated based on the agnathan and fish assemblage. STRATIGRAPHIC POSITION: These beds are approximately 0.5–0.7 m thick, overlying sand, sandstone, and clay strata without faunal remains and underlying the Middle Jurassic beds.

• bed-level stratigraphic resolution

Environment/lithology: lagoonal; poorly lithified, gray, blue claystone and poorly lithified, black, argillaceous sandstone

• ENVIRONMENT: Coastal–marine or lagoon.
• SPECIFIC LITHOLOGY: Bone beds are bluish gray dense clay, gray and black condensed clayey sand and sandstone. LITHIFICATION: Poorly-lithified, on the basis of figured specimens.

Size class: macrofossils

Collected by Moloshnikov in 2002; reposited in the PIN

Collection methods: surface (in situ),

• COLLECTOR: Moloshnikov (2002). REPOSITORY: Paleontological Institute of the Russian Academy of Sciences (PIN).

Primary reference: S. V. Moloshnikov. 2007. Psammosteiforms (Agnatha, Heterostraci) from the Lower Frasnian of the Mikhailovskii Mine, Kursk Region, Russia. Paleontological Journal 41(5):84-88 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 90343: authorized by Austin Hendy, entered by Austin Hendy on 17.07.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for marine vertebrate taxa. NOMENCLATURE: Authoritative publication, with modern nomenclature and species-resolution identifications.
 Psammosteiformes - Pycnosteidae
? Tartuosteus zheleznogorskensis n. sp. Moloshnikov 2007
 Psammosteiformes - Psammosteidae
Chondrichthyes indet. Huxley 1880 cartilaginous fish
 Acanthodei - Acanthoessidae
Haplacanthus sp. Agassiz 1845 shark
 Ischnacanthida -
Atopacanthus sp. Hussakof and Bryant 1920 spiny fish
 Diplacanthiformes -
Devononchus concinnus Gross 1940 spiny fish
 Antiarcha - Asterolepididae
Asterolepis radiata armour-plated fish
Asterolepis cf. syasiensis armour-plated fish
Asterolepis sp. Eichwald 1840 armour-plated fish
Asterolepis ornata Eichwald 1840 armour-plated fish
 Arthrodira -
Plourdosteus livonicus armour-plated fish
 Ptyctodontida -
Ptyctodontida indet. Gross 1932 armour-plated fish
 Ptyctodontida - Ptyctodontidae
Ptyctodus sp. Pander 1858 armour-plated fish
 Palaeonisciformes - Palaeoniscidae
 Dipnoi - Dipteridae
Dipteridae indet. Owen 1846 lungfish
 Coelacanthiformes -
 Onychodontiformes - Onychodontidae
Onychodus sp. Newberry 1857 lobe-finned fish
 Osteolepidida - Osteolepididae
Osteolepididae indet. Cope 1887 lobe-finned fish
Glyptolepis sp. Agassiz 1843 lobe-finned fish
 Porolepiformes - Holoptychiidae
Holoptychius sp. Agassiz 1843 lobe-finned fish
Laccognathus sp. Gross 1941 lobe-finned fish