109-1/6 Mirny Creek Section (Silurian of Russian Federation)

Where: Russian Federation (64.0° N, 147.2° E: paleocoordinates 16.0° N, 10.4° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Akidograptus ascensus graptolite zone, R Member (Maut Formation), Rhuddanian (443.4 - 440.8 Ma)

• Bed R73. Not clear if this is the very latest Hirnantian or the very earliest Rhuddanian. PJW: No, past-me, it is Rhuddanian.... ;-) Dapsilodus obliquicostatus - Distomodus kentuckyensis conodont zone. Was Chalmak, but now Maut, which overlies the Tirekhtyakh Formation and underlies the Sandagun Formation. "R member"

• bed-level stratigraphic resolution

Environment/lithology: limestone

• The Tirekhtyakh Formation is from 255 to 320 m thick locally
• Micritic limestone

Size classes: macrofossils, mesofossils

Primary reference: T. N. Koren and R. F. Sobolevskaya. 2008. The regional stratotype section and point for the base of the Hirnantian Stage (the uppermost Ordovician) at Mirny Creek, Omulev Mountains, Northeast Russia. Estonian Journal of Earth Sciences 57(1):1-10 [P. Wagner/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 152991: authorized by Pete Wagner, entered by Pete Wagner on 04.12.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Pterobranchia
 Graptoloidea - Neodiplograptidae
 Graptoloidea - Retiolitidae
Glyptograptus tamariscus Nicholson 1868 graptolite
Rhynchonellata
 Protorthida - Skenidiidae
 Atrypida - Atrypinidae
Eospirigerina putilla Hall and Clarke 1894
Eospirigerina putilla prisca
 Atrypida -
Zygospiraella sp. Nikiforova 1961
Trilobita
 Phacopida - Phacopidae
Acernaspis sp. Campbell 1967 trilobite