Mont-Jean Horizon, Mont-Jean, massif des Bornes, Haute-Savoie (Cretaceous of France)

Where: France (45.9° N, 6.3° E: paleocoordinates 34.7° N, 12.3° E)

• coordinate stated in text

• small collection-level geographic resolution

When: Leymeriella tardefurcata ammonoid zone, Couches des Verds Member (Grès verts helvétiques Formation), Early/Lower Albian (112.0 - 109.0 Ma)

• bed-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified, hardground, phosphatic marl

Size class: macrofossils

Preservation: replaced with phosphate

Primary reference: M. Delamette, J. Charollais, D. Decrouez and M. Caron. 1997. Les grès verts helvétiques (Aptien moyen-Albien supérieur) de Haute-Savoie, Valais et Vaud (Alpes occidentales franco-suisses). Publications du Département de Géologie et Paléontologie. Section des Sciences de la Terre 23:1-400 [L. Villier/L. Villier/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 56561: authorized by Loic Villier, entered by Loic Villier on 21.11.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

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Echinoidea
 Holectypoida - Discoididae
Discoides conicus
 Salenioida - Hyposaleniidae
Hyposalenia studeri
Gastropoda
  -
Gastropoda indet.
Gastropoda indet. Cuvier 1795 snail
 Sorbeoconcha - Naticidae
Natica sp.
Natica sp. Scopoli 1777 moon snail
 Sorbeoconcha - Aporrhaidae
Perissoptera sp., Tessarolax bicornis
Perissoptera sp. Tate 1865 snail
 Cerithioidea - Metacerithiidae
Metacerithium sp.
Metacerithium sp. Cossmann 1906 snail
 Pleurotomarioidea - Pleurotomariidae
Pleurotomaria sp.
Pleurotomaria sp. Defrance 1826 snail
 Trochoidea - Turbinidae
Semisolarium sp.
Semisolarium sp. Cossmann 1915 snail
 Vetigastropoda - Discohelicidae
Nummocalcar sp.
Nummocalcar sp. Cossmann 1896 snail
Cephalopoda
 Ammonoidea -
Ammonoidea indet.
 Phylloceratida - Phylloceratidae
Phyllopachyceras baborense, ? Phylloceras sp.
Phyllopachyceras baborense Coquand 1880 ammonite
? Phylloceras sp. Suess 1865 ammonite
 Ammonitida - Ptychoceratidae
Ptychoceras laeve
Ptychoceras laeve Gabb 1869 ammonite
 Ammonitida - Acanthohoplitidae
Hypacanthoplites sp., Hypacanthoplites inflatus, Hypacanthoplites clavatus, Hypacanthoplites elegans, Hypacanthoplites plesiotypicus, Hypacanthoplites milletianus
Hypacanthoplites sp. Spath 1923 ammonite
Hypacanthoplites clavatus ammonite
3 distinct sub-species mentioned
Hypacanthoplites elegans Fritel 1906 ammonite
Hypacanthoplites plesiotypicus Fritel 1906 ammonite
Hypacanthoplites milletianus d'Orbigny 1841 ammonite
 Ammonitida - Leymeriellidae
Leymeriella tardefurcata, Leymeriella ex gr. tardefurcata
Leymeriella tardefurcata Leymerie 1841 ammonite
Leymeriella ex gr. tardefurcata Leymerie 1841 ammonite
 Ammonitida - Brancoceratidae
? Brancoceras sp. n. sp.
? Brancoceras sp. n. sp. Steinmann 1881 ammonite
 Ammonitida - Beudanticeratidae
Beudanticeras convergens
Beudanticeras convergens Jacob 1908 ammonite
 Ammonitida - Desmoceratidae
Puzosia quenstedti, ? Melchiorites sp., "Desmoceras latidorsatum" = Desmoceras (Desmoceras) latidorsatum
Puzosia quenstedti Parona and Bonarelli 1897 ammonite
? Melchiorites sp. Spath 1923 ammonite
"Desmoceras latidorsatum" = Desmoceras (Desmoceras) latidorsatum Michelin 1838 ammonite
Bivalvia
 Pectinida - Plicatulidae
Plicatula radiola
 Cardiida - Glossidae
Isocardia crassicornis
 Nuculanida - Isoarcidae
Isoarca agassizi
Rhynchonellata
 Terebratulida - Sellithyrididae
? Moutonithyris sp.