Le Corbeau Point, Plougastel Peninsula, Rade de Brest: Lochkovian, France

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
Crinoidea
Crinoidea indet. Miller 1821
Strophomenata - Strophomenida - Amphistrophiidae
Mclearnites (Mclearnitesella) lecaroensis
Strophomenata - Strophomenida - Rafinesquinidae
Hollardina plana Racheboeuf et al. 1982
Rhynchonellata - Spiriferida - Spiriferidae
Howellella mercurii (Gosselet 1880)
original and current combination Spirifer mercurii
Rhynchonellata - Athyridida - Meristellidae
Meristella renaudae
Rhynchonellata - Orthida - Proschizophoriidae
Proschizophoria sp.
Rhynchonellata - Orthida - Platyorthidae
Platyorthis monnieri
Trilobita - Phacopida - Homalonotidae
Homalonotidae indet. Chapman 1890
see common names

Geography
Country:France
Coordinates: 48.3° North, 4.4° West (view map)
Paleocoordinates:51.1° South, 36.5° 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 Member:Kerdeniel
Stratigraphic resolution:member
Stratigraphy comments: "Outcrops of the Kerdenial Member, at the base of the Landevennec Formation..."
Lithology and environment
Primary lithology:hummocky CS,"cross stratification",ferruginous 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: "...restricted to a calcareous, commonly ferruginous, coarse-grained sandstone...hummocky c.s....wave crossbedding..."
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: "[lithology suggests] shallow, rough water environment. The community is generally known only in a few meter interval. All characters suggest a BA 2-3 position..In the western part of the Chateaulin Synclinorium, the H.p. Comm. commonly overlies the Grammysia armorica Comm. and is overlain by the Howellella-Mesodouvillina-Platyorthis Comm. type."
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Reason for describing collection:paleoecologic analysis
Metadata
Also known as:Hollardina plana Community, Kerdeniel Mbr., Landevennec Fm., Armorican Massif
Database number:26116
Authorizer:M. Foote Enterer:M. Foote
Modifier:P. Wagner Research group:marine invertebrate
Created:2002-10-04 07:20:27 Last modified:2018-11-10 11:16:03
Access level:the public Released:2002-10-04 07:20:27
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]