Mt. Perda Liana, Unit III (MGP) (Jurassic of Italy)

Where: Italy (39.9° N, 9.4° E: paleocoordinates 32.5° N, 14.9° E)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Perda Liana Member (Dorgali Formation), Early/Lower Bathonian (167.7 - 164.7 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: lagoonal or restricted shallow subtidal; lithified, bioturbated, nodular, shelly/skeletal, gray, muddy wackestone

• low energy open lagoon (shelf lagoon) environment
• Unit III consists of grey-beige, very fine-grained, heavily bioturbated, limestone (wackestone and mudstone), commonly marly, with conchoidal fracture, in places containing a small fine-grained quartz fraction. A lower plane-parallel-bedded interval 19 m thick shows muddy interbeds, plant remains, molluscs (among which very abundant infaunal bivalves, usually in life position), common brachiopods and characteristic bioclastic infilling

•of burrows. It grades into an interval 20.5 m thick, where compaction on thorough bioturbation resulted in a predominantly flaser to nodular bedding (Fig. 4).

Size classes: macrofossils, mesofossils

Collected by Dieni

• Repository: Museo di Geologia e Paleontologia, Universita di Padova, Dieni Collection (MGP)

Primary reference: I. Dieni, F. Massari, and V. Radulovic. 2013. The Mt Perda Liana section (Middle Jurassic, central-eastern Sardinia): revised stratigraphy and brachiopod faunas. Bollettino della Società Paleontologica Italiana 52(2):123-138 [M. Clapham/M. Manojlovic/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 160187: authorized by Matthew Clapham, entered by Marko Manojlovic on 16.08.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Siphovalvulina
  -
Bivalvia
 Pectinida - Limidae
Plagiostoma hellica d'Orbigny 1850 file clam
 Ostreida - Eligmidae
 Ostreida - Palaeolophidae
Actinostreon gregareum Sowerby 1816 oyster
 Ostreida - Pteriidae
Pteroperna costatula Eudes-Deslongchamps 1824 pearl oyster
 Pholadida - Ceratomyidae
Ceratomya striata Sowerby 1815 clam
 Pholadomyida - Pholadomyidae
Pholadomya lirata Sowerby 1818 clam
Homomya gibbosa Sowerby 1814 clam
Gastropoda
 Architaenioglossa - Ampullinidae
 Architaenioglossa - Viviparidae
Echinoidea
 Salenioida - Acrosaleniidae
Acrosalenia hemicidaroides Wright 1851 sea urchin
Rhynchonellata
 Terebratulida - Postepithyrididae
Holcothyris angulata Buckman 1917
 Rhynchonellida - Tetrarhynchiidae