Ust'irgisla Beds of unnamed (Bezymyannyi) Stream 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 Formation, Pridoli (423.0 - 419.2 Ma)

• formation-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal, gray limestone and dolomitic limestone

• "(1) Grey, stratified, pelitimorphic, medium crystalline and light grey organogenous limestones...(2) some dolomitic limestones and grey stratified limestones...(3) grey, poorly stratified, massive, microcrystalline and organogenous limestones...(5) grey, irregularly coloured, poorly stratified, microcrystalline and pelitimorphic limestones..."

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 13954: authorized by Michael Foote, entered by Michael Foote on 06.05.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Anthozoa
 Favositida - Cleistoporidae
Riphaeolites priscus
Riphaeolites priscus tabulate coral
 Favositida - Favositidae
Favosites aff. diffusus
 Rugosa - Chonophyllidae
Ketophyllum sp.
Ketophyllum sp. Wedekind 1927 horn coral
 Cystiphyllida - Cystiphyllidae
Microplasma gotlandica
Rhynchonellata
 Spiriferida - Reticulariidae
"Proreticularia pentameriformis" = Alaskospira
"Proreticularia pentameriformis" = Alaskospira
 Athyridida - Meristidae
Merista upsilon
 Atrypida - Atrypinidae
Spirigerina supramarginalis
 Atrypida - Atrypidae
Atrypa sublepida
Atrypa sublepida
genus name in quotes
 Atrypida - Lissatrypidae
Tectatrypa tectiformis, Lissatrypa linguata, Lissatrypa kuschvensis, Lissatrypa sp., Lissatrypa latisinuata, Lissatrypa camelina
Lissatrypa sp. Twenhofel 1914
 Pentamerida - Gypidulidae
Gypidula eleganta, Gypidula problematica, Gypidulina optata
 Rhynchonellida -
? Uralotoechia kuschvensis
Cephalopoda
 Nautiloidea -
Nautiloidea indet.
Nautiloidea indet. Agassiz 1847 nautiloid
orthoceratites