Le Corbeau Point, Plougastel Peninsula, Rade de Brest (Devonian of France)

Also known as Hollardina plana Community, Kerdeniel Mbr., Landevennec Fm., Armorican Massif

Where: France (48.3° N, 4.4° W: paleocoordinates 51.1° S, 36.5° E)

• coordinate based on political unit

• local area-level geographic resolution

When: Kerdeniel Member (Landevennec Formation), Lochkovian (419.2 - 410.8 Ma)

• "Outcrops of the Kerdenial Member, at the base of the Landevennec Formation..."

• member-level stratigraphic resolution

Environment/lithology: marine; ferruginous, calcareous sandstone

• 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."

• 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..."

Size class: macrofossils

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 26116: 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
Crinoidea
  -
Crinoidea indet.
Crinoidea indet. Miller 1821 Sea lily
Strophomenata
 Strophomenida - Amphistrophiidae
Mclearnites (Mclearnitesella) lecaroensis
 Strophomenida - Rafinesquinidae
Hollardina plana
Hollardina plana Racheboeuf et al. 1982
Rhynchonellata
 Spiriferida - Spiriferidae
"Howellella mercurii" = Spirifer mercurii
"Howellella mercurii" = Spirifer mercurii Gosselet 1880
 Athyridida - Meristellidae
Meristella renaudae
 Orthida - Proschizophoriidae
Proschizophoria sp.
 Orthida - Platyorthidae
Platyorthis monnieri
Trilobita
 Phacopida - Homalonotidae
Homalonotidae indet.
Homalonotidae indet. Chapman 1890 trilobite