Taas-Aryy Island (Ulakhan-Krest Formation 11 (0,8m) (Triassic of Russian Federation)

Where: Russian Federation (71.8° N, 127.2° E: paleocoordinates 66.1° N, 7.4° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Eonathorstites oleshkoi ammonoid zone, 11 Member (Ulakhan-Krest Formation), Ladinian (242.0 - 237.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, concretionary, gray, green, argillaceous siltstone

• Dark-greenish-gray fine-grained and inequigranular

•argillaceous siltstones with separate concretion interbeds

•of lump-like phosphorite-calcareous concretions. Also,

•lenses and interbeds (up to 0.15 m thick) of fine phos-

•phorite pebble conglomerates occur. Two conglomerate in-

•terbeds (localized 1.2 m apart) lie in the base of the bed.

Size class: macrofossils

Primary reference: A. G. Konstantinov, E. S. Sobolev, and A. V. Yadrenkin. 2007. Detailed biostratigraphy of Triassic deposits in the Lena lower reaches(northern Yakutia). Russian Geology and Geophysics 48:721-736 [M. Aberhan/D. Wellmanns]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 124544: authorized by Martin Aberhan, entered by Daniel Wellmanns on 18.02.2012, edited by Matthew Clapham

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Ceratitida - Longobarditidae
Grambergia taimyrensis Popov 1961 ceratite
 Ceratitida - Parapopanoceratidae
Stenopopanoceras mirabile Popov 1961 ceratite
Bivalvia
 Ostreida - Bakevelliidae
Bakevellia (Maizuria) arctica Kiparisova 1937 oyster
Rhynchonellata
 Spiriferinida - Lepismatinidae
"Costispiriferina lenaensis" = Lepismatina lenaensis
"Costispiriferina lenaensis" = Lepismatina lenaensis Dagys 1985
Lingulata
 Lingulida - Lingulidae
Lingularia sp. Biernat and Emig 1993