Blacourt Fm., Couderousse Mbr., vicinity of Ferques, Bas-Boulonnais (Devonian of France)

Where: France (50.8° N, 1.8° E: paleocoordinates 24.4° S, 4.3° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Couderousse Member (Blacourt Formation), Givetian (387.7 - 382.7 Ma)

• upper-middle varcus conodont zone

• member-level stratigraphic resolution

Environment/lithology: marine; black limestone

• "The Blacourt Formation is a compact, massive bedded, black fossiliferous marine limestone, with argillaceous layers and some small reefs in the Griset Member. The lower [Cambreseque] and upper [Patures] member of the Beaullieu Formation are mainly terrigenous, except for its lowest beds, the so-called Cedule Limestone. The middle [Noces] member consists of dolomite lenses, passing upward into shales, and to a reef build-up capped by fossiliferous limestones. The base of the lower [Fiennes] member of the succeeding Ferques Formation is a biostromal dolomite overlain by yellow, then brownis-dark dolomite and dolomitic sandstones. These are overlain by the fully marine fossiliferous Ferques Limestone. The lower part of the [second-from-bottom] Bois Member and the upper part of the [third-from-bottom] Parisienne Member are biostromal. In the upper [Gris] member, sediments are more argillaceous..."

Primary reference: P. Morzadec, D. Brice, C. Cygan, R. Feist, C. Majeste-Menjoulas, F. Paris, and P. R. Racheboeuf. 2000. The Devonian of France: a tentative tie with the GSSP of the Devonian stages. Courier Forschungs-Institut Senckenberg 225:115-129 [M. Foote/M. Foote/M. Foote]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 38683: authorized by Michael Foote, entered by Michael Foote on 28.04.2004, edited by Uta Merkel

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Trilobita
 Proetida - Proetidae
Ostracoda
 Metacopida -
 Podocopida -
 Podocopida - Sigilliidae
 Podocopida - Healdiidae
 Podocopida -
Podocopina indet.4 Sars 1866 ostracod
 Podocopida - Bythocyprididae
Bythocypris "sp. G1"4 Brady 1880 ostracod
 Podocopida - Pachydomellidae
 Podocopida - Macrocyprididae
 Podocopida - Acratiidae
Acratia "sp. G1"4 Delo 1930 ostracod
 Podocopida - Bairdiidae
Bairdia "sp. 1"4 M'Coy 1844 ostracod
 Podocopida - Bairdiocyprididae
 Podocopida -
 Palaeocopida -
 Palaeocopida - Drepanellidae
 Palaeocopida - Primitiidae
? Coryellina sp.4 Kellett 1935 ostracod
 Palaeocopida -
 Platycopida - Knoxitidae
 Platycopida - Youngiellidae
 Platycopida - Paraparchitidae
 Platycopida - Coelonellidae
 Platycopida - Cavellinidae
Stenolaemata
 Cystoporida - Fistuliporidae
 Rhabdomesida - Nikiforovellidae
Crinoidea
  -
Crinoidea indet.3 Miller 1821 Sea lily
Le Menn has given formal names to several columnal taxa.
Rhynchonellata
 Athyridida - Athyrididae
 Terebratulida - Stringocephalidae
Stringocephalus burtini2 Defrance 1825
 Spiriferinida - Cyrtinidae
 Spiriferida - Cyrtospiriferidae
 Spiriferida - Reticulariidae
 Atrypida - Atrypidae
 Orthida - Rhipidomellidae
Anthozoa
 Auloporida - Aulocystidae
Aulocystis sp.6 Schl├╝ter 1885 tabulate coral
 Favositida -
? Dendropora sp.7 Michelin 1846 tabulate coral
Stromatoporoidea
 Amphiporida - Amphiporidae
? Amphipora sp.5 Schulz 1883