Howellella-Mesodouvil.-Platyorth. Comm., Landevennec Fm., Armorican Massif: Lochkovian, France

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Scyphozoa - Conulariida
Conulariida indet. Miller and Gurley 1896
Rhynchonellata - Spiriferida - Delthyrididae
Howellella sp. Kozlowski 1946
Rhynchonellata - Athyridida - Meristellidae
Meristella sp.
Rhynchonellata - Orthida - Dalmanellidae
Isorthis sp. Kozlowski 1929
Rhynchonellata - Orthida - Rhipidomellidae
Dalejina sp. Havlicek 1953
Rhynchonellata - Orthida - Platyorthidae
Platyorthis sp.
Rhynchonellata - Orthida - Proschizophoriidae
Proschizophoria sp.
Rhynchonellata - Terebratulida - Meganterididae
Mutationella sp.
Rhynchonellata - Terebratulida - Rhipidiothyrididae
Lievinella sp.
Rhynchonellata - Rhynchonellida
Rhynchonellida indet. Kuhn 1949
Strophomenata - Strophomenida - Amphistrophiidae
Mclearnites (Mclearnitesella) sp.
Strophomenata - Orthotetida - Chilidiopsidae
Iridistrophia sp. Havlicek 1965
Bivalvia - Grammysiidae
Grammysia sp. de Verneuil 1847
Bivalvia - Nuculanida - Malletiidae
Palaeoneilo sp. Hall and Whitfield 1869
Xiphosura
Merostomata indet. Dana 1852
synonym of Xiphosura
Trilobita - Phacopida - Acastidae
Acastella sp. Reed 1925
Trilobita - Phacopida - Homalonotidae
Homalonotus sp. König 1825
see common names

Geography
Country:France
Coordinates: 48.2° North, 4.1° West (view map)
Paleocoordinates:51.2° South, 36.9° East
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
Formation:Landevennec
Stratigraphic resolution:formation
Stratigraphy comments: Landevennec Fm. (Sandstone) and also Gahard Formation.
Lithology and environment
Primary lithology: calcareous sandstone
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:"calcareous, sandy facies"
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... 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
Taxonomic list comments:Based upon PBDB coll. 26117 and the statement that the two assemblages are strikingly similar, with some substitutions (which are detailed by the authors and which form the basis for differences between this faunal list and that of coll. 26117).
Metadata
Database number:26118
Authorizer:M. Foote Enterer:M. Foote
Modifier:M. Foote Research group:marine invertebrate
Created:2002-10-04 07:42:01 Last modified:2006-09-15 15:14:05
Access level:the public Released:2002-10-04 07:42:01
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]