Patrocardia evolvens Community at La Meignanne, Massif Armoricain (Devonian of France)

Where: France (47.5° N, 0.7° W: paleocoordinates 51.4° S, 40.7° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Monograptus uniformis zone, Lochkovian (419.2 - 410.8 Ma)

• "Lowermost Lochkovian"

• group of beds-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal, calcareous claystone and shelly/skeletal lime mudstone

• "Deposit feeders absent. Diversity relatively high. High density pop'ns only of the dominant sp....Less favorable living conditions. Low or almost no current activity, below wave base, low sedimentation rate and possibly lower oxygen content."
• "Mostly disarticulated bivalves are preserved in the dark, calcareous claystones to micritic limestones with abundant, scattered, nektobenthic cephalopod shells."

Collection methods: Life mode and abundance of bivalves given (table 16.20). Only bivalves explicitly said to occur at type locality, but text suggests other elements present as well.

Primary reference: J. Kříž. 1999. Bivalvia communities of Bohemian type from the Silurian and Lower Devonian carbonate facies. In A. J. Boucot. J. D. Lawson (ed.), Paleocommunities -- A case study from the Silurian and Lower Devonian 229-252 [M. Foote/M. Foote/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 14186: authorized by Michael Foote, entered by Michael Foote on 22.05.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• Bivalves are the focus; other taxa mentioned but not listed fully.
Bivalvia
  -
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam
 Pectinida - Pterinopectinidae
 Ostreida - Pterineidae
 Myalinida - Lunulacardiidae
Patrocardia evolvens Barrande 1881 clam
Patrocardia ex gr. evolvens Barrande 1881 clam
 Cyrtodontida - Spanilidae
Spanila sp. Barrande 1881 clam
 Cyrtodontida - Antipleuridae
 Lucinida - Mactromyidae
Cephalopoda
  -
Cephalopoda indet. Cuvier 1797