Cheiopteria bridgei Comm., Upper Pridoli, SW Sardinia (Silurian of Italy)

Where: Sardinia, Italy (39.5° N, 8.5° E: paleocoordinates 58.8° S, 51.6° E)

• coordinate estimated from map

• local area-level geographic resolution

When: M. transgrediens zone, Fluminimaggiore Formation, Pridoli (423.0 - 419.2 Ma)

• In this study, isolated blocks were correlated on basis of contained conodonts. Fluminimaggiore Fm., Upper Pridoli, M. transgrediens zone. Very similar composition to community in Bohemia suggests same age.

• member-level stratigraphic resolution

Environment/lithology: marine; shelly/skeletal, gray wackestone and calcareous shale

• ""The mass occurrence of shells may be as a result of regular mass mortalities caused by abiotic conditions...Low oxygen content and very low current activity may be presumed."
• General for this formation: "45-50 m thick alternation of black calcareous lenticular layers (peloid-cephalopod-ostracod wackestone-packstones grading to mudstones) with dark non calcareous pelites and shales. The upper part of the formation is characterized by more marly limestones and terminates with a crinoid bioclastic packstone horizon."

•For this community: "Disarticulated shells occur in the dark micritic to biomicritic lenticular limestone which originally formed horzion in the calcareous shale."

Collection methods: Table 6 gives numerical abundances and inferred life habits of bivalves.

Primary reference: J. Kříž and E. Serpagli. 1993. Upper Silurian and lowermost Devonian Bivalvia of Bohemian type from south-western Sardinia. Bolletino della Societa Paleontologica Italiana 32(3):289-347 [M. Foote/M. Foote/P. Wagner]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 26182: authorized by Michael Foote, entered by Michael Foote on 07.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
  -
"Pelecypoda indet." = Bivalvia
"Pelecypoda indet." = Bivalvia Linnaeus 1758 clam
 Cyrtodontida - Antipleuridae
 Myalinida - Lunulacardiidae
Patrocardia sp. Fischer 1887 clam
Patrocardia "sp. A" Fischer 1887 clam
 Ostreida - Pterineidae
 Pterioida -