[2] Here it developed a series of marine-related depositional settings, represented by an outcrop of 550–600 m of grey Calcarenites and Calcilutites with chert lenses and marly interbeds, that recovers the Sedrina, Moltrasio and Domaro Formations.

[6] The outcrop is a good documentation of a particularly complete fauna and flora of the Lower Jurassic which is not exactly common in the Southern Alps.

[6] The Osteno outcrop, part of the formation, is worldwide known due to the exceptional preservation of mostly marine biota, including rare fossilized components, helping to understand the ecosystems of the local Sinemurian margin of the Monte Generoso Basin.

[7] The high local variety of fossils found is most likely due to unique conditions of preservation, where phosphatized soft tissues have not been observed in any fish or polychaetes, but they are common in crustaceans (33%) and also occur in a smaller percentage of teuthids (14%).

[8] Soft part preservation through phosphatization in this deposit includes the muscles and branchia of Crustaceans, fish tissues, and the digestive tracts of coleoids, polychaetes, and nematodes.

Aeger[5][6][12][13] Multiple specimens fairly preserved Osteno Outcrop A decapod, type member of the family Aegeridae.

Coleia[5][6][12][14][15][16] Multiple specimens fairly preserved Osteno Outcrop A decapod, type member of the family Coleiidae.

[19] Glyphea[17] 137 complete and fragmentary specimens Osteno Outcrop A decapod, type member of the family Erymidae.

The species was originally included in the genus Eryma as E. meyeri, although the specimens reveal morphological characters diagnostic of Palaeastacus.

[19] Phlyctisoma[17] 10 specimens, in a fairly good state of preservation Osteno Outcrop A decapod, type member of the family Erymidae.

[19] Pseudoglyphea[5][12][16] 7 complete specimens, in a fairly good state Osteno Outcrop A decapod, member of the family Litogastroidae.

Ostenoteuthis[5][6][16][26][27] Several specimens with decent preservation Osteno outcrop A coleoid, type member of the family Ostenoteuthidae.

Uncinoteuthis[6][27] An incomplete specimen consisting of the arm crown only Osteno outcrop A coleoid, member of the family Ostenoteuthidae.

Palaeocoma[6][16] Multiple specimens Ubiale - Clanezzo An ophiuridan, member of the family Ophiodermatidae inside Ophiodermatina.

Extant tropical species like Ophioderma are benthic predators and scavengers that show the same short spines seen in Palaeocoma.

nov Virtually complete skull with associated parts of the branchial skeleton Osteno Outcrop A chimaerid, member of the family Myriacanthidae inside Chimaeriformes.

Ostenoselache[6][16] One complete articulated specimen Osteno Outcrop An euselachiian, type member of the family Ostenoselachidae inside Elasmobranchii.

With an elongated eel-shaped morphology, the specimens found measure at least 240 mm in length, with a neurocranium with a long, complex rostrum.

Palaeospinax[16][31] A single specimen in four contiguous pieces and including parts of the dentition and squamation Osteno Outcrop A Shark, type member of the family Palaeospinacidae inside Synechodontiformes.

Squaloraja[16][30][32] One complete articulated specimen Osteno Outcrop A chimaerid, type member of the family Squalorajidae inside Squalorajoidei.

Probably represents the only known Jurassic survivor of the order Peltopleuriformes Undina[6][33] Osteno Outcrop A Coelacanth, member of the family Latimeriidae inside Coelacanthiformes.

Isolated 20 mm scales of coelacanths analogous to the genus Holophagus are quite frequent on the Osteno deposits, suggesting a taxon up to 75 cm long.