Taas-Aryy Island (Ulakhan-Krest Formation 12 (10 m) (Triassic of Russian Federation)

Where: Russian Federation (71.8° N, 127.2° E: paleocoordinates 65.6° N, 13.5° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Boreohungarites kharaulakhensis ammonoid zone, 12 Member (Ulakhan-Krest Formation), Anisian (247.2 - 242.0 Ma)

• bed-level stratigraphic resolution

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

• Dark- and greenish-gray fine-grained (and inequi-

•granular, in the base) siltstones. The bed contains calcare-

•ous concretions, pyrite nodules, and interbeds and lenses

•of calcareous siltstones.

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 124551: authorized by Martin Aberhan, entered by Daniel Wellmanns on 18.02.2012

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Ostreida - Bakevelliidae
Hoernesia torta, Bakevallia (Maizuria) arctica
Hoernesia torta Popov 1964 oyster
Bakevallia (Maizuria) arctica Kiparisova 1937 oyster
Cephalopoda
 Nautilida - Tainoceratidae
Arctonautilus cf. egorovi
 Pseudorthocerida - Trematoceratidae
Trematoceras sp.
Trematoceras sp. Eichwald 1851
 Ceratitida - Longobarditidae
Intornites nevadanus
Intornites nevadanus Hyatt and Smith 1905 ceratite
 Ceratitida - Parapopanoceratidae
Parapopanoceras asseretoi
Parapopanoceras asseretoi Dagys and Ermakova 1981 ceratite
 Ceratitida - Ceratitidae
Gymnotoceras inflatum, Gymnotoceras tasaryense
Gymnotoceras inflatum Konstantinov 1991 ceratite
Gymnotoceras tasaryense Konstantinov 1991 ceratite