Lower Siyak Beds of Siyak River Section (Devonian of Russian Federation)

Where: Bashkir, Russian Federation (53.1° N, 57.4° E: paleocoordinates 0.5° N, 16.3° E)

• coordinate based on nearby landmark

When: Lower Siyak Beds Formation, Lochkovian (419.2 - 410.8 Ma)

• group of beds-level stratigraphic resolution

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

• "(1) Grey, stratified, pelitomorphic, microcrystalline, crinoidal limestones...(2) Float of dark grey clay shale [with] small outcrops of grey limestones...(3) grey, bedded, finely crystalline and pelitic limestones... (4) grey, thick-bedded, cryptocrystalline 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 13941: authorized by Michael Foote, entered by Michael Foote on 03.05.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

 Strophomenida - Douvillinidae
Cymostrophia sp. Caster 1939
 Athyridida - Meristidae
 Athyridida - Athyrididae
 Pentamerida - Gypidulidae
 Pentamerida - Clorindidae
 Atrypida - Atrypidae
 Atrypida - Atrypinidae
 Atrypida - Lissatrypidae
"? Hircinisca posthircina" = Septatrypa (Hircinisca)
"? Hircinisca posthircina" = Septatrypa (Hircinisca)
 Rhynchonellida - Camarotoechiidae
 Rhynchonellida - Hebetoechiidae
Gastropoda indet. Cuvier 1797 snail
 Orthocerida - Orthoceratidae
 Favositida - Favositidae
Favosites lucidus tabulate coral
Favosites delectus tabulate coral
Favosites intricatus Pocta 1902 tabulate coral
 Favositida - Cleistoporidae
Riphaeolites ramosus tabulate coral
Riphaeolites cf. ramosus tabulate coral
Riphaeolites virgosus tabulate coral
 Favositida - Pachyporidae
Cladopora actuosa tabulate coral
 Favositida - Parastriatoporidae
 Rugosa -
 Stauriida - Ptenophyllidae
 Stauriida - Pycnostylidae
? Zelophyllum sp. Wedekind 1927 horn coral
Zelophyllum sp. Wedekind 1927 horn coral
 Stauriida - Mucophyllidae