Well FT 3, Unit 7 (Silurian of Russian Federation)

Where: Siberia, Russian Federation (49.4° N, 136.4° E: paleocoordinates 34.0° N, 64.6° E)

• coordinate based on political unit

• small collection-level geographic resolution

When: Climacograptus cyphus zone, Rhuddanian (443.4 - 440.8 Ma)

• Unnamed formation; shown as strat. equiv. of Chamba Fm.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, gray, argillaceous siltstone and limestone

• Dark grey clayey limestones alternate with black graptolitic mudstones.

Collection methods: core,

Primary reference: O. K. Bogolepova and J. Kříž. 1995. Ancestral forms of Bohemian type Bivalvia from the lower Silurian of Siberia (Tungusskaja Syneclise, Russia). Géobios 28(6):691-699 [J. Alroy/M. Sommers/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 3346: authorized by John Alroy, entered by Mike Sommers on 30.07.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• Limestones contain cephalopods, brachs, ostracods, and bivalves.
Cephalopoda
 Pseudorthocerida - Pseudorthoceratidae
Mongoceras angustum Miagkova 1967
 Dissidocerida - Geisonoceratidae
Geisonoceras kureikense Zhuraleva 1964
Bivalvia
 Cyrtodontida - Antipleuridae
Sibirinka amora Bogolepova and Kříž 1995 clam
nov. gen. et nov. sp.
 Ostreida - Pterineidae
Actinopteria pumila Bogolepova and Kříž 1995 oyster
nov. sp.
Brachiopoda
  -
Brachiopoda indet. Cuvier 1805
rare indet. brachs
Deuteropoda
  -
Ostracoda indet. Latreille 1802 ostracod
indet. ostracods, rare