Siberian belemnite at Agapa, Bed VII (Cretaceous of Russian Federation)

Where: Russian Federation (71.5° N, 89.3° E: paleocoordinates 68.8° N, 62.7° E)

• coordinate estimated from map

When: Inoceramus labiatus inoceramid zone, Dorozhovskaya Formation, Turonian (93.9 - 89.8 Ma)

Environment/lithology: offshore; gray siltstone

• The observed facies development there suggests a gradual shift from continental to fully marine deposits at the Cenomanien-Turonian boundary.
• Bed VII (20 m) is a dark grey, bituminous clayey siltstone. According to Zakharov et al. (1991), this bed represents the maximum transgressive level in North-western Sibiria and it may be the local expression of the global OAE II... in its middle part, a horizon of greenish grey siltstone with large (100-400 mm) clay-ironstone concretions occurs.

Size classes: macrofossils, mesofossils

• concretions yielded a very rich fauna consisting of Mytiloides labiatus (Schlotheim, 1813), Inoceramus agapensis Khomentovsky, 1992, Mytiloides cf. hattini Elder, 1991, Borissiakoceras inconstans Cobban and Cryc, 1961, Praeactinocamax aff. plenus (Blainville, 1825), small bivalves (Cucullaea sp.),and gastropods with primary aragonite preserved

Primary reference: M. Košták and F. Wiese. 2008. Lower Turonian record of belemnite Praeactinocamax from NW Siberia and its palaeogeographic significance. Acta Palaeontologica Polonica 53(4):669-678 [B. Seuss/B. Seuss/B. Seuss]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 215821: authorized by Barbara Seuss, entered by Barbara Seuss on 24.11.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Bivalvia
 Myalinida - Inoceramidae
Inoceramus agapensis, Mytiloides cf. hattini, Mytiloides labiatus
Inoceramus agapensis clam
in concretions
Mytiloides cf. hattini clam
in concretions
Mytiloides labiatus Schlotheim 1813 clam
in concretions
 Arcida - Cucullaeidae
Cucullaea sp.
Cucullaea sp. Lamarck 1801 clam
in concretions
Cephalopoda
 Ammonitida - Binneyitidae
Borissiakoceras inconstans
Borissiakoceras inconstans Cobban and Gryc 1961 ammonite
in concretions
 Belemnitida - Belemnitellidae
Praeactinocamax aff. plenus
Praeactinocamax aff. plenus de Blainville 1827 belemnite
in concretions; two morphotypes
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
with primary aragonite