Fu3a, Furlo Pass (Grilli Quarry) (Jurassic of Italy)

Where: Italy (43.6° N, 12.7° E: paleocoordinates 30.0° N, 18.3° E)

• coordinate estimated from map

• small collection-level geographic resolution

When: Jamesoni (189.6 - 183.0 Ma)

• Belong to the lithostratigraphic unit called "Corniola." Miltoceras Mediterranean zone, probably the basal part, correlated with Polymorphus subzone of Jamesoni zone.

• bed-level stratigraphic resolution

Environment/lithology: slope; lithified floatstone

• Their facies is characteristic of reduced or condensed successions (ramp or Calcare Massiccio sensu lato facies, sometimes referred as “Corniola massiccia”, i.e. “massive Corniola”), without regular stratification and sometimes encrinitic. Fossils occur in a very localized area, and they are restricted to sublenticular bodies, where very often the material looks fragmented (but never reworked), without evident sorting or orientation. The features of these lumachellas seem indicative of sedimentation by discontinuous episodic inputs, originated as markedly canalized gravitative deposits (debrites). In all probability, the material constituting these debrites came from a more elevated portion of the sea-bottom, and, after rather short transport, it was deposited in a slope environment without the contribution of waves or currents.
• Bioclasts (for the most part ammonites) appear to float in an abundant matrix,

•which is almost always recrystallized, and show internal cavities frequently filled by druse cements, but without evident geopetal structures.

Size class: macrofossils

Preservation: cast, mold/impression

Collection methods: Repository: Earth Sciences Department, Università degli Studi di Perugia

Primary reference: F. Venturi, C. Nannarone, and M. Bilotta. 2007. Ammonites from the early Pliensbachian of the Furlo Pass (Marche, Italy): biostratigraphic and paleobiogeographic implications. Bollettino della Società Paleontologica Italiana 46:1-31 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 147083: authorized by Matthew Clapham, entered by Matthew Clapham on 05.07.2013

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Cephalopoda
 Ammonitida - Polymorphitidae
"Paramorphites acutiventris n. gen. n. sp." = Polymorphites acutiventris, Tropidoceratinae indet.
"Paramorphites acutiventris n. gen. n. sp." = Polymorphites acutiventris Venturi et al. 2007 ammonite
Tropidoceratinae indet. Hyatt 1900 ammonite
 Ammonitida - Eoderoceratidae
"Spiniclaviceras spirale n. gen. n. sp." = Metaderoceras spirale
"Spiniclaviceras spirale n. gen. n. sp." = Metaderoceras spirale Venturi et al. 2007 ammonite
 Ammonitida - Coeloceratidae
Miltoceras furlense n. sp.
Miltoceras furlense n. sp. Venturi et al. 2007 ammonite
 Ammonitida - Lytoceratidae
"Aegolytoceras sp." = Alocolytoceras, Galaticeras sp., Lytoceras sp.
"Aegolytoceras sp." = Alocolytoceras Hyatt 1900 ammonite
Galaticeras sp. ammonite
Lytoceras sp. Suess 1865 ammonite
 Ammonoidea - Sinuiceratidae
Sinuiceratidae indet., Sphenoacanthites costotuberculatum
Sinuiceratidae indet. Venturi et al. 2005 ammonite
Sphenoacanthites costotuberculatum Rakús and Guex 2002 ammonite
 Phylloceratida - Phylloceratidae
Phylloceras sp.
Phylloceras sp. Suess 1865 ammonite
 Phylloceratida - Juraphyllitidae
Juraphyllites sp.
Juraphyllites sp. Müller 1939 ammonite