Howellella-Mesodouvil.-Platyorth. Comm., Noulette Fm., Noulette borehole, Artois: Lochkovian, France

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Scyphozoa - Conulariida
Conulariida indet. Miller and Gurley 1896
Trilobita - Phacopida - Acastidae
Acastella sp. Reed 1925
Trilobita - Phacopida - Homalonotidae
Homalonotus sp. König 1825
Xiphosura
Merostomata indet. Dana 1852
synonym of Xiphosura
Strophomenata - Strophomenida - Amphistrophiidae
Mesodouvillina (Mesodouvillina) sp. Williams 1950
Strophomenata - Orthotetida - Chilidiopsidae
Iridistrophia sp. Havlicek 1965
Rhynchonellata - Spiriferida - Delthyrididae
Howellella sp. Kozlowski 1946
Rhynchonellata - Athyridida - Meristellidae
Meristella sp.
Rhynchonellata - Rhynchonellida
Rhynchonellida indet. Kuhn 1949
Rhynchonellata - Terebratulida - Meganterididae
Mutationella sp.
Rhynchonellata - Terebratulida - Rhipidiothyrididae
Lievinella sp.
Rhynchonellata - Orthida - Platyorthidae
Platyorthis sp.
Rhynchonellata - Orthida - Dalmanellidae
Isorthis sp. Kozlowski 1929
Rhynchonellata - Orthida - Proschizophoriidae
Proschizophoria sp.
Bivalvia - Nuculanida - Malletiidae
Palaeoneilo sp. Hall and Whitfield 1869
Bivalvia - Grammysiidae
Grammysia sp. de Verneuil 1847
see common names

Geography
Country:France
Coordinates: 50.5° North, 2.5° East (view map)
Paleocoordinates:25.9° South, 4.5° West
Basis of coordinate:based on political unit
Geographic resolution:local area
Time
Period:Devonian Epoch:Early/Lower Devonian
Stage:Lochkovian 10 m.y. bin:Devonian 1
*International age/stage:Early/Lower Lochkovian
Key time interval:Lochkovian
Age range of interval:419.20000 - 410.80000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Geological group:Lievin Formation:Noulette
Stratigraphic resolution:formation
Stratigraphy comments: "from the Noulette Fm. (='Calcaire d'Agnres and 'Schistes de Drocourt' sensu Barrois et al. 1922) of the Lievin Group."
Lithology and environment
Primary lithology:"cross stratification",bioturbation calcareous "shale"
Secondary lithology:"cross stratification",bioturbation calcareous siltstone
Includes fossils?Y
Includes fossils?Y
Lithology description: 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..."
Environment:marine indet.
Geology comments: 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."
Taphonomy
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Metadata
Database number:26117
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Foote Research group:marine invertebrate
Created:2002-10-04 07:31:37 Last modified:2006-09-15 15:14:05
Access level:the public Released:2002-10-04 07:31:37
Creative Commons license:CC BY
Reference information

Primary reference:

7245. 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]