Bed 18, Dvuyakornaya Fm (Cretaceous of Ukraine)

Where: Ukraine (45.0° N, 35.4° E: paleocoordinates 0.0° N, 51.2° E)

• outcrop-level geographic resolution

When: Dvuyakornaya Formation, Berriasian (145.0 - 139.8 Ma)

• STRATIGRAPHIC RELATIONS: From the Dvuyakornaya Fm (Tithonian-Berriasian), which is bounded by the Khutoran and Sultanovka fms. AGE: Berriasian, on the basis of ammonite, foraminiferal, and ostracod biostratigraphy. STRATIGRAPHIC POSITION: From beds 18-23 of the Dvuyakornaya Fm.

• bed-level stratigraphic resolution

Environment/lithology: basinal (); lithified claystone

• ENVIRONMENT: accumulation of these sediments below the waves base level, i.e., outside

•the shelf, at depths ranging from 300–400 m and greater.

• SPECIFIC LITHOLOGY: Claystone. LITHIFICATION: Lithified, on the basis of figured specimens.

Size classes: macrofossils, mesofossils, microfossils

Preservation: cast, mold/impression

Collection methods: bulk, surface (float), surface (in situ), sieve,

• COLLECTOR: Not stated in text. REPOSITORY: Unknown.

Primary reference: V. V. Arkad'ev, A. A. Fedorova, Y. N. Savale'eva and E. M. Tesakova. 2006. Biostratigraphy of Jurassic–Cretaceous Boundary Sediments in the Eastern Crimea. Stratigraphy and Geological Correlation 14(3):302-330 [A. Hendy/A. Hendy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 162310: authorized by Austin Hendy, entered by Austin Hendy on 21.09.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for ammonites, foraminifera, and ostracod a. NOMENCLATURE: Not an authoritative publication, but with modern nomenclature, and species-resolution identifications.
unclassified
  -
Nodosariata
 Robertinida - Epistominidae
 Nodosariida - Nodosariidae
 Vaginulinida - Vaginulinidae
Globothalamea
 Rotaliida - Discorbidae
Foraminifera
  -
 Lituolida - Lituolidae
  -
 Biokovinacea - Charentiidae
 Spirillinina - Spirillinidae
 Loftusiacea - Cyclamminidae
 Lituolacea - Mayncinidae
 Involutinina - Trocholinidae
Cephalopoda
 Phylloceratida - Phylloceratidae
"Ptychophylloceras cf. semisulcatum" = Phylloceras semisulcatum
"Ptychophylloceras cf. semisulcatum" = Phylloceras semisulcatum d'Orbigny 1842 ammonite
 Ammonitida - Neocomitidae
 Ammonitida - Haploceratidae
Haploceras sp. Zittel 1870 ammonite
Ostracoda
 Myodocopida - Cypridinidae
Cypridina sp. Milne-Edwards 1840 ostracod
 Platycopida -
 Platycopida - Cytherellidae
 Podocopida -
 Podocopida - Cytherideidae
 Podocopida - Cytheruridae
 Podocopida - Bairdiidae
Bairdia sp. M'Coy 1844 ostracod
Bairdia "sp. A" M'Coy 1844 ostracod
 Podocopida - Macrocyprididae
  -