Howellella-Mesodouvil.-Platyorth. Comm., Noulette Fm., Noulette borehole, Artois (Devonian of France)

Where: France (50.5° N, 2.5° E: paleocoordinates 25.9° S, 4.5° W)

• coordinate based on political unit

• local area-level geographic resolution

When: Noulette Formation (Lievin Group), Lochkovian (419.2 - 410.8 Ma)

• "from the Noulette Fm. (='Calcaire d'Agnres and 'Schistes de Drocourt' sensu Barrois et al. 1922) of the Lievin Group."

• formation-level stratigraphic resolution

Environment/lithology: marine; bioturbated, calcareous shale and bioturbated, calcareous siltstone

• General statement of Central Armorican trough during Llandovery through Lochkovian: "depositional patterns typical of a platform environment...Silurian is mainly an alternating succession of unfossiliferous sandstones and locally fossiliferous black shales...The arenaceous deposits are probably related to the eustatic regression and corresponding high sedimentation rate during the Pridolian and Lochkovian...Outside the A. Massif the Pridoli-Lochkovian succesion in Artois (boreholes) is characterized by shallow marine shales and limestones overlain by areanceous deposits that correspond to the Early Devonian transgression."

•For this Community: "BA 2...appears reasonable. In Artois this comm. overlies the Leptaena-Rugosatrypa comm. and is overlain by the Tentaculitid-Actinopteria Comm."

• General statement: "In Brittany there are two kinds of black shale and limestone deposits during the Llandovery to lowermost Devonian interval: (1) black shales (commonly described as sapropelites) are widespread in space and time and (2) black, micritic limestones or argillaceous limestones are restricted to two localities in the eastern part of the Armorican Massif. The black shales are very rich in organic matter and locally contain detrital mica, pyrite, and nodules..."

•For this community: "occurs in dark, calcareous shale and siltstone, locally highly bioturbated, and with wave crossbedding which suggests a high water energy level..."

Primary reference: P. R. Racheboeuf. 1999. Lower Silurian to Lower Devonian communities from the Armorican Massif (western France) and Artois (northern France). In A. J. Boucot, J. D. Lawson (eds.), Paleocommunities--a case study from the Silurian and Lower Devonian 260-270 [M. Foote/M. Foote/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 26117: authorized by Michael Foote, entered by Michael Foote on 04.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Scyphozoa
 Conulariida -
Conulariida indet.
Conulariida indet. Miller and Gurley 1896 jellyfish
Xiphosura
  -
"Merostomata indet." = Xiphosura
"Merostomata indet." = Xiphosura Latreille 1802
Trilobita
 Phacopida - Acastidae
Acastella sp.
Acastella sp. Reed 1925 trilobite
 Phacopida - Homalonotidae
Homalonotus sp.
Homalonotus sp. König 1825 trilobite
Bivalvia
 Cardiidia - Grammysiidae
Grammysia sp.
Grammysia sp. de Verneuil 1847 clam
 Nuculanida - Malletiidae
Palaeoneilo sp.
Palaeoneilo sp. Hall and Whitfield 1869 clam
Rhynchonellata
 Athyridida - Meristellidae
Meristella sp.
 Rhynchonellida -
Rhynchonellida indet.
 Terebratulida - Rhipidiothyrididae
Lievinella sp.
 Terebratulida - Meganterididae
Mutationella sp.
 Orthida - Platyorthidae
Platyorthis sp.
 Orthida - Proschizophoriidae
Proschizophoria sp.
 Orthida - Dalmanellidae
Isorthis sp.
Isorthis sp. Kozlowski 1929
 Spiriferida - Delthyrididae
Howellella sp.
Howellella sp. Kozlowski 1946
Strophomenata
 Orthotetida - Chilidiopsidae
Iridistrophia sp.
Iridistrophia sp. Havlicek 1965
 Strophomenida - Amphistrophiidae
Mesodouvillina (Mesodouvillina) sp.