PBDB Collection

Ust'irgisla Beds of Siyak River Section (Silurian of Russian Federation)

Where: Bashkir, Russian Federation (53.1° N, 57.4° E: paleocoordinates 0.1° N, 14.7° E)

• coordinate based on nearby landmark

When: Ust'irgisla Beds Formation, Pridoli (423.0 - 419.2 Ma)

• Fauna suggests correlation with Skala stage of Podolia.

• formation-level stratigraphic resolution

Environment/lithology: marine; gray limestone and argillaceous shale

• "Lower part of beds composed of grey and light grey microcrystalline, stratified and poorly stratified limestones, sometimes schistose, in certain places with columnar corals and rare tabulate corals, tetracorals, and brachiopods...Upper part ...represented by interbanded limestones and clay shales..."

Primary reference: A. P. Tyazheva and R. A. Zhavoronkova. 1977. Southern Urals. in A. Martinsson, ed. The Silurian-Devonian boundary (IUGS, Series A, Number 5). Schweizerbart'sche, Stuttgart. 203-210 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 13940: authorized by Michael Foote, entered by Michael Foote on 03.05.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

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Anthozoa
Favositida - Favositidae	Favosites aff. difformis, Favosites ex gr. socialis Favosites aff. difformis tabulate coral Favosites ex gr. socialis tabulate coral
Stauriida - Entelophyllidae	Entelophyllum sp. Entelophyllum sp. Wedekind 1927 horn coral
Cystiphyllida - Cystiphyllidae	Microplasma cf. gotlandica Microplasma cf. gotlandica horn coral
Rhynchonellata
Spiriferida - Reticulariidae	"Proreticularia pentameriformis" = Alaskospira "Proreticularia pentameriformis" = Alaskospira
Atrypida - Lissatrypidae	Lissatrypa kuschvensis, Lissatrypa prunum Lissatrypa kuschvensis Lissatrypa prunum