Burgemak (Unit 9) (Cretaceous of Russian Federation)

Where: Russian Federation (42.3° N, 47.3° E: paleocoordinates 34.9° N, 52.2° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Gundara Formation, Aptian (125.0 - 113.0 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; poorly lithified, massive, fine-grained, concretionary, argillaceous sandstone

• Brown, friable, fine grained, clayey sandstones containing large (up to 1.5 m in diameter) spherical concretions of clayey calcareous sandstone

Size classes: macrofossils, mesofossils

Collected by Smirnova; reposited in the PIN

Primary reference: T. N. Smirnova. 2012. Early Cretaceous Rhynchonellids of Dagestan: System, Morphology, Stratigraphic and Paleobiogeographic Significance. Paleontological Journal 46(11):1197-1296 [M. Clapham/M. Manojlovic]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 155767: authorized by Matthew Clapham, entered by Marko Manojlovic on 30.04.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Rhynchonellata
 Rhynchonellida - Tetrarhynchiidae
Burrirhynchia oweni, Kudrjavzevina fragilis n. sp.
Burrirhynchia oweni Smirnova 2012
shells with broken umbos
Kudrjavzevina fragilis n. sp. Smirnova 2012
includes 25 laterally compressed shells
 Rhynchonellida - Cyclothyrididae
Cyclothyris gibbsiana, Cyclothyris zudakharica, Cyclothyris dagestanica n. sp.
Cyclothyris gibbsiana Sowerby 1829
Cyclothyris zudakharica Smirnova 2012
Cyclothyris dagestanica n. sp. Smirnova 2012