Rio Cosarivo, Cassano Valcuvia (Triassic of Italy)

Where: Varese, Italy (45.9° N, 8.7° E: paleocoordinates 8.9° N, 20.0° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Archelaus ammonoid zone, Cunardo Formation, Longobardian (242.0 - 235.0 Ma)

• A single fossiliferous layer at the very top of the Cunardo Formation, overlain (likely unconformably) by the Pizzella Marl. The ammonoids recognised in this bed are considered to be of the Archelaus zone, indicating an early Late Ladinian age (Calabrese & Balini 1995).

• bed-level stratigraphic resolution

Environment/lithology: limestone

• "The fossiliferous layer is a dolomitic microsparite with pelagic bivalves (also hinged), bioturbation (burrowing), fine shreds of organic matter and local submillimetric concentrations of phosphatic compound. Authigenic quartz and feldspars are also present." (Calabrese & Balini 1995)

Size class: macrofossils

Primary reference: L. Calabrese and M. Balini. 1995. The discovery of ammonoids in the Cunardo Formation (Varese). A new chronostratigraphic interpretation. Rivista Italiana di Paleontologia e Stratigrafia 101(3):367-370 [A. Dunhill/B. Allen]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 211519: authorized by Alex Dunhill, entered by Bethany Allen on 20.07.2020

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ceratitida - Trachyceratidae
? Protrachyceras sp., Anolcites sp., Argolites sp.
? Protrachyceras sp. Mojsisovics 1893 ceratite
Anolcites sp. Mojsisovics 1893 ceratite
Argolites sp. Renz 1939 ceratite
 Ceratitida - Ceratitidae
Detoniceras sp.
Detoniceras sp. Manfrin and Mietto 1991 ceratite
Bivalvia
  -
Bivalvia indet.
Bivalvia indet. Linnaeus 1758 clam