Well FT 3, Unit 4 (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, black, argillaceous siltstone and limestone

• Black graptolitic mudstones and dark grey clayey cephalopod limestone.

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 3343: authorized by John Alroy, entered by Mike Sommers on 30.07.1999

Creative Commons license: CC BY (attribution)

Taxonomic list

• Graptolites in mudstone, everything else in limestone.
Strophomenata
 Productida - Strophochonetidae
Kentronetes conulus
originally entered as "Kentronites conulus"
 Strophomenida - Plectambonitidae
Plectambonitidae indet. Kozlowski 1929
gen. et sp. indet.
Bivalvia
 Cyrtodontida - Antipleuridae
Sibirinka amora n. gen. n. sp.
Sibirinka amora n. gen. n. sp. Bogolepova and Kříž 1995 clam
nov. gen. et nov. sp.
Gastropoda
 Euomphalina - Platyceratidae
"Platyceras aff. cornutum" = Platyostoma cornutum
"Platyceras aff. cornutum" = Platyostoma cornutum Hisinger 1837 snail
"ex gr. P. cornutum" - originally entered as "Platyceras aff. cornutum"
Cephalopoda
 Orthocerida - Geisonoceratidae
 Oncocerida -
Graptolithina
 Bireclinata - Normalograptidae
Normalograptus sp. Legrand 1987 graptoloid