Kyafar River, between Storozhenvaya and Ispravnaya villages (baculatum subzone) (Jurassic of Russian Federation)

Where: Russian Federation (43.9° N, 41.5° E: paleocoordinates 38.4° N, 47.5° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Strenoceras niortense ammonoid zone, Djangura Formation, Late/Upper Bajocian (171.6 - 167.7 Ma)

• Baculatoceras baculatum Subzone, upper member of the Djangura Formation

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, nodular siltstone

• Dark gray to black argillites, with layers of argillaceous limestone and scattered argillaceous-carbonate sideritized concretions, up to 50 m in total.

Size class: macrofossils

Reposited in the PIN

Primary reference: V. V. Mitta. 2017. The ammonoid genus Spiroceras (Spiroceratidae, Ammonoidea) from the Upper Bajocian of the northern Caucasus. Paleontological Journal 51:133-142 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 185036: authorized by Matthew Clapham, entered by Matthew Clapham on 08.04.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Spiroceratidae
Spiroceras bispinatum, Spiroceras annulatum, Spiroceras aff. fourneti
Spiroceras bispinatum Baugier and Sauze 1843 ammonite
Spiroceras annulatum d'Orbigny 1850 ammonite
Spiroceras aff. fourneti Romand and Petouraud 1927 ammonite