Boyarka River-2 (Cretaceous of Russian Federation)

Where: Siberia, Russian Federation (70.8° N, 97.6° E: paleocoordinates 71.2° N, 81.5° E)

• small collection-level geographic resolution

When: Hectoroceras kochi zone, I Member, Berriasian (145.0 - 139.8 Ma)

• member-level stratigraphic resolution

Environment/lithology: marine; gray, green, silty, calcareous claystone

• lithology described as clayey silt (I), passing into silty clay (II), followed by well-sorted clay (III), and capped with clays with thin intercalations of grey silty limestone and a large number of small (0.05-0.15m) calcareous concretions (IV)

Size class: macrofossils

Primary reference: V. N. Saks, ed. 1975. The Jurassic-Cretaceous Boundary and the Berriasian Stage in the Boreal Realm. 1-319 [M. Patzkowsky/K. Layou/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 2467: authorized by Mark Patzkowsky, entered by Karen Layou on 05.07.1999, edited by Austin Hendy

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Polyptychitidae
Surites cf. tzikwinianus, Surites cf. spasskensis, Surites aff. spasskensis, Surites ex gr. stenomphalus, Hectoroceras kochi, Subcraspedites suprasubditus, aff. Subcraspedites suprasubditus
Surites cf. tzikwinianus ammonite
originally entered as "Surites cf. tzikwinianus"
Surites cf. spasskensis ammonite
originally entered as "Surites cf. spasskensis"
Surites aff. spasskensis ammonite
originally entered as "Surites aff. spasskensis"
Surites ex gr. stenomphalus Pavlow 1890 ammonite
originally entered as "Surites ex gr. stenomphalus"
Hectoroceras kochi Spath 1947 ammonite
aff. Subcraspedites suprasubditus ammonite
originally entered as "Subcraspedites aff. suprasubditus"
 Belemnitida - Belemnitidae
cf. Cylindroteuthis baculus, cf. Cylindroteuthis porrectiformis
cf. Cylindroteuthis baculus belemnite
originally entered as "Cylindroteuthis cf. baculus"
cf. Cylindroteuthis porrectiformis Anderson 1945 belemnite
originally entered as "Cylindroteuthis cf. porrectiformis"
Bivalvia
 Carditida - Astartidae
Prorokia transitoria
 Pectinida - Buchiidae
Buchia sp., Buchia volgensis
Buchia sp. Rouillier 1845 scallop
Buchia volgensis Lahusen 1888 scallop
 Myalinida - Inoceramidae
Inoceramus sp.
Inoceramus sp. Sowerby 1814 clam
 Mytilida - Mytilidae
Modiolus sp.
Modiolus sp. Lamarck 1801 mussel
 Nuculida - Nuculidae
Nucula sp.
Nucula sp. Lamarck 1799 nut clam
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
Foraminifera
  -
"Marginulina glabroides" = Cristellaria (Marginulina)
"Marginulina glabroides" = Cristellaria (Marginulina)
 Ammodiscoidea - Ammodiscidae
Ammodiscus veteranus
Nodosariata
 Nodosariida - Nodosariidae
Marginulinopsis majmetchensis
Marginulinopsis majmetchensis
Marginulinopsis borealis majmetchensis