Mk 8b, Makariev section on the Unzha River, Kostroma (Jurassic of Russian Federation)

Where: Russian Federation (57.9° N, 43.8° E: paleocoordinates 51.9° N, 44.9° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Early/Lower Kimmeridgian (155.7 - 150.8 Ma)

• Mk 8b - 0.50 m; Baylei Zone

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified mixed carbonate-siliciclastic sediments

• The Makariev section ends with the base of the Kimmeridgian. The stage crops out on the waterside of the Kuibyshev Reservoir (Volga River, 25 km north of the town of Ulyanovsk), between Dubky and Mimei localities. It is a thick alternance (54 m and visual gap) of marls and argillaceous limestones, containing only one black shale horizon. - Lithology based on description of Kimmeridgian deposits of Dubky and Mimei localities.

Size class: macrofossils

Primary reference: P. Hantzpergue, F. Baudin, V. Mitta, A. Olferiev, and V. A. Zakharov. 1998. The Upper Jurassic of the Volga basin: ammonites biostratigraphy and correlations with standard European zonations. C. R. Acad. Sci. Paris, Sciences de la terre et des planetes 326:633-640 [M. Aberhan/S. Nurnberg]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 58837: authorized by Martin Aberhan, entered by Sabine Nürnberg on 25.02.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Aulacostephanidae
Pictonia baylei, "Desmosphinctes cf. mniovnikensis" = Prorasenia
"Desmosphinctes cf. mniovnikensis" = Prorasenia ammonite
 Goniatitida - Prionoceratidae
Amoeboceras sp., Amoeboceras (Amoebites) cf. kitchini
Amoeboceras sp. Hyatt 1900 ammonite