Chrtníky quarry, Unit 4 (upper cond. interval) [Bilá Fm] (Cretaceous of Czech Republic)

Where: Czech Republic (50.0° N, 15.6° E: paleocoordinates 40.1° N, 14.6° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Bilá Formation, Early/Lower Turonian (93.5 - 89.3 Ma)

• STRATIGRAPHIC RELATIONS: From the Bilá Fm, which overlies the Korycany Mbr of the Peruc-Korycany Fm. AGE: Early Turonian, presumably on the basis of foraminiferal and macrofossils biostratigraphy. STRATIGRAPHIC POSITION: From a deep depression, named the Giant Channel, situated in the eastern part of the quarry. Collection is from Unit 4 (upper condensation interval), which is about 5-15 cm thick.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, hardground, phosphatic, stromatolitic, brown, green, argillaceous limestone

• SPECIFIC LITHOLOGY: Sharp erosional surface, frequently with protruding bioclasts. The color is greenish to brownish, with notronite or phosphate coatings. The erosional surface is overlain by stromatiolitic buildups, which may be up to 10 cm thick. These comprise thin limestone layers alternating with thin clay coatings. LITHIFICATION: Lithified, on the basis of facies description ad figured specimens.

Size class: macrofossils

Collected by Vodrazka & Zitt

Collection methods: bulk, surface (in situ),

• COLLETORS: Vodrazka & Zitt. REPOSITORY: Institute of Geology (Academy of Sciences of the Czech Republic) in Prague.

Primary reference: J. Zitt, R. Vodrázka, L. Hradecká, M. Svobodová, and K. Zágorsek. 2006. Late Cretaceous environments and communities as recorded at Chrtníky (Bohemian Cretaceous Basin, Czech Republic). Bulletin of Geosciences 81(1):43-79 [A. Hendy/A. Hendy]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 90514: authorized by Austin Hendy, entered by Austin Hendy on 04.08.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for macro invertebrates and microfossils. NOMENCLATURE: Not an authoritative publication, but with relatively modern nomenclature and species-resolution identifications.
Crinoidea
 Cyrtocrinida - Holopodidae
Cyathidium aff. depressum Sieverts 1932 Sea lily
Echinoidea
  -
Echinoidea indet. Leske 1778 sea urchin
Bivalvia
  -
Bivalvia indet. Linnaeus 1758 clam
 Ostreida - Gryphaeidae
"Ostrea cf. operculata" = Pycnodonte (Phygraea) proteus
"Ostrea cf. operculata" = Pycnodonte (Phygraea) proteus Reuss 1848 oyster
Brachiopoda
  -
Brachiopoda indet. Cuvier 1805
Bryozoa
  -
Bryozoa indet. Ehrenberg 1831
unclassified
  -
Annelida indet. Lamarck 1809