Cardiola donigala Comm., Ludlow, SW Sardinia (Silurian of Italy)

Where: Sardinia, Italy (39.7° N, 8.5° E: paleocoordinates 61.5° S, 54.4° E)

• coordinate estimated from map

• local area-level geographic resolution

When: Fluminimaggiore Formation, Ludlow (427.4 - 423.0 Ma)

• In this study, isolated blocks were correlated on basis of contained conodonts. Fluminimaggiore Fm., lower part of the Ludlow, above the M. colonus Biozone and below or contemporneous with the S. fristschi linearis Biozone; this is deduced from the known occurrences of all species in Bohemica [and apparently also partly on inferred phylogeny?]. Donigala Tectonic Subunit of the ARburese Unit; assignment to Fl. Formation is questioned.

• member-level stratigraphic resolution

Environment/lithology: marine; lime mudstone and calcareous shale

• "Disarticulated shells...Population densities and diversity relatively low. Common nektobenthic ceph. shells provided a substrate for exclusively epibyssate bivalves."
• 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: "dark micritic lenticular limestone, which originally formed a horizon in the calcareous shale."

Collection methods: Table 4 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 26180: authorized by Michael Foote, entered by Michael Foote on 07.10.2002

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Nautiloidea -
Nautiloidea indet. Agassiz 1847 nautiloid
"Abundant nektobenthic unrevised orthocone cephalopods."
Bivalvia
 Cyrtodontida - Stolidotidae
 Cyrtodontida - Cardiolidae
Cardiola donigala Kříž and Serpagli 1993 clam
Cardiola cf. signata Barrande 1881 clam
 Cyrtodontida - Slavidae
 Myalinida - Lunulacardiidae
Patrocardia sp. Fischer 1887 clam