Omnutakh River, about 35 km south of Norilsk (Silurian of Russian Federation)

Where: Siberia, Russian Federation (69.0° N, 88.2° E: paleocoordinates 14.9° N, 5.6° E)

• outcrop-level geographic resolution

When: First Formation (Khyuktinsky Group), Sheinwoodian (433.4 - 430.5 Ma)

• "The base of the reefal unit is approximately on the Wenlockian-Llandoverian boundary"

• member-level stratigraphic resolution

Environment/lithology: limestone

• The Khyuktinsky suite may be broken into four subdivisions. The lowest is rich in stromatoporoids and corals and is about 2 m thick, but in one place rises to a cone 10 m high. It is overlain by a sequence of limestones and mudstones 55-60 m thick. The third unit is more a biostrome than a true reef and is 1.5-2.0 m thick. The youngest part of the sequence consists primarily of limestone containing some interbedded mudstone.

Size classes: macrofossils, mesofossils

Primary reference: A. P. Gubanov and E. L. Yochelson. 1994. A Wenlockian (Silurian) gastropod shell and operculum from Siberia. Journal of Paleontology 68(3):486-491 [P. Wagner/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 138752: authorized by Pete Wagner, entered by Pete Wagner on 26.01.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

• Central Siberian Geological Museum
 Euomphalina - Euomphalidae
"Straparollus alacer" = Philoxene alacer
"Straparollus alacer" = Philoxene alacer Perner 1903 snail
 Euomphalina - Oriostomatidae
Australonema varvarae n. sp. Gubanov and Yochelson 1994 snail