Also known as Kyafar River

Where: Karachaevo-Cherkessiya, Russian Federation (43.9° N, 41.5° E: paleocoordinates 38.3° N, 47.4° E)

• coordinate estimated from map

When: Orthogarantiana humilis ammonoid zone, Djangura Formation, Bajocian (170.3 - 168.3 Ma)

• upper Lower Bajocian– lower Upper Bajocian; subsequently, this part of the section was conditionally assigned to the lower part of the Niortense zone, isolated in the Kuban River basin, as the Humilis Subzone (Mitta, 2021c).

• group of beds-level stratigraphic resolution

Environment/lithology: marine; claystone

Size class: macrofossils

• There were no ammonites with a preserved aperture, with or without lappets, among these shells. However, we can assume the presence of a dimorphic pair in this sample: with a similar size, some specimens have relatively wide whorls and a long (0.9 whorl) body chamber (Figs. 2c, 2d), while others have noticeably narrower whorls, with a shortened body chamber (0.75 whorl) (Figs. 2f, 2g). Most likely, the former are macroconchs, and the latter, respectively, microconchs.

Preservation: concretion

Reposited in the PIN

Collection methods: surface (in situ),

• Borissiak Paleontological Institute, Russian Academy of Sciences (PIN RAS), coll. no. 5546.

Primary reference: V. V. Mitta. 2024. Superfamily Perisphinctoidea (Ammonoidea) in the Bajocian–Lower Bathonian of the Kuban River Basin (Northern Caucasus, Russia). Paleontological Journal 58(1):44-55 [S. Peters/E. Mazko]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 234961: authorized by Shanan Peters, entered by Evgeny Mazko on 24.05.2024

Creative Commons license: CC BY (attribution)