Cheiopteria bridgei Community, La Megnanne, Massif Armoricain (Silurian of France)

Where: France (47.5° N, 0.7° W: paleocoordinates 55.8° S, 43.0° E)

• coordinate based on nearby landmark

• local area-level geographic resolution

When: Monograptus transgrediens zone, Pridoli (423.0 - 419.2 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; calcareous claystone and argillaceous limestone

• "The occurrence of open articulated shells and articulated closed shells documents periodic mass mortalities caused by abiotic conditions. The preservation shows that current activity was very low close to the bottom, while sedimentation rate was rapid enough to cover the open shells before they disarticulated. Deposit feeders were absent...[and diversity low]....I presume that the envronment was relatively shallow (young ontogenetic stages present), below wave base, with low oxygen content and very low current activity."
• "The shells occur at the type locality in dark, calcareous claystones to argillaceous limestones, mostly articulated..."

Collection methods: Life modes and abundances given for bivalves. List based on taxa listed in table 16.13 (type locality).

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 14167: authorized by Michael Foote, entered by Michael Foote on 20.05.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

• Bivalves are focus of taxon list. Other taxa mentioned but not listed in detail.
Show authors, comments, and common names
Cephalopoda
  -
Cephalopoda indet.
Cephalopoda indet. Cuvier 1797
common shell fragments
Bivalvia
 Cyrtodontida - Antipleuridae
Dualina socialis, Dualina aff. consors
 Myalinida - Lunulacardiidae
Patrocardia bohemica
 Ostreida - Pterineidae
Cheiopteria bridgei