A revision of the ammonite faunas of the type Cenomanian, 5. Acanthoceratinae Calycoceras (Calycoceras), C. (Gentoniceras) and C. (Newboldiceras).

This contribution continues the revision of the ammonite faunas of the type Cenomanian dealing with the Middle and Upper Cenomanian species of Calycoceras (Calycoceras), C. (Gentoniceras), and C. (Newboldiceras). The following are described and illustrated. C. (C.) naviculare (Mantell, 1822), C. (C.) bathyomphalum (Kossmat, 1895), C. (G.) gentoni (Brongniart, 1822), C. (G.) sarthacense (Bayle, 1878), C. (G.) boehmi (Spath, 1926b), C. (N.) asiaticum asiaticum (Jimbo, 1894), C. (N.) asiaticum spinosum (Kossmat, 1897), C. (N) asiaticum hunteri (Kossmat, 1897), C.(N.) planecostatum (Kossmat, 1897), C. (N.) hippocastanum (J. de C. Sowerby, 1826), and C. (N.) tunetanum (Pervinquière, 1907). © 1994 Academic Press. All rights reserved

A revision of the ammonite faunas of the Type Cenomanian. 4. Acanthoceratinae (Acompsoceras, Acanthoceras, Protacanthoceras, Cunningtoniceras and Thomelites)

This contribution continues the revision of the ammonite faunas of the Type Cenomanian. The Middle or Upper Cenomanian species Acompsoceras renevieri (Sharpe, 1857), A. inconstans (Schlüter, 1871), A. aff. inconstans, Acanthoceras rhotomagense (Brongniart, 1822), A. jukesbrownei (Spath, 1926a), A. pseudorenevieri (Spath, 1926b), Protacanthoceras tuberculatum tuberculatum Thomel, 1972, Cunningtoniceras cunningtoni (Sharpe, 1855), C. inerme (Pervinquière, 1907), C. lonsdalei (Adkins, 1928), C. diadema (Spath, 1926b), and Thomelites sornayi (Thomel, 1966) are described and illustrated. © 1993 Academic Press. All rights reserved

Upper cenomanian ammonites from the environs of Saumur, and the provenance of the types of Ammonites vibrayeanus and Ammonites geslinianus

Ammonite faunas consisting of Neolobites vibrayeanus (d'Orbigny), Calycoceras (Calycoceras) naviculare (Mantell), C. (Lotzeites(?)) sp., Pseudocalycoceras lattense Thomel, Metoicoceras geslinianum (d'Orbigny) and Euomphaloceras septemseriatum (Cragin) from Saumur, within the type area of the Turonian stage, are described from the collections of the Château de Saumur. They allow the recognition of two Upper Cenomanian horizons at Saumur, the one equivalent to the Sciponoceras gracile/Metoicoceras geslinianum Zone as developed in the Sables à Catopygus obtusus/Sables de Bousse of the Cenomanian stratotype; the other, older assemblage equates with the Calycoceras naviculare/Eucalycoceras pentagonum Zone fauna known from the Marnes à Ostracées of the type Cenomanian. From lithological comparisons it is suggested that this area is the source of the types of both Metoicoceras geslinianum and Neolobites vibrayeanus, which are redescribed. © 1981 Academic Press Inc. (London) Ltd

Ammonites diartianus d'Orbigny, 1850,Vascoceratidae du cénomanien supérieur de saint-calais (Sarthe)

Ammonites diartianus d'Orbigny is a Vascocerasoof late Cenomanian (Sciponoceras gracile Zone) age, occuring in both Sarthe (France) and southern England. It is the earliest vascoceratid known from France, and its recognition is of great significance, lending support to recent suggestions that the classic Vascoceras gamai - mundae Choffat group are of Upper Cenomanian age. © 1997

A revision of the ammonite faunas of the typeCenomanian. 2. The families Binneyitidae, Desmoceratidae, Engonoceratidae, Placenticeratidae, Hoplitidae, Schloenbachiidae, Lyelliceratidae and Forbesiceratidae

In this part of the revision of the ammonite faunas of the type Cenomanianwe deal with representatives of the genera Borissiakoceras, Austiniceras, Neolobites, Metengonoceras, Placenticeras, Hyphoplites, Schloenbachia, Stoliczkaia (Lamnayella), Stoliczkaia (Shumarinaia), Euhystrichoceras and Forbesiceras. © 1984 Academic Press Inc. (London) Limited

A revision of the ammonite faunas of the type Cenomanian 6. Acanthoceratinae (Calycoceras (Proeucalycoceras), Eucalycoceras, Pseudocalycoceras, Neocardioceras), Euomphaloceratinae, Mammitinae and Vascoceratidae

This contribution completes the systematic part of the revision of the ammonite faunas of the type Cenomanian, dealing with Calycoceras (Proeucalycoceras), Pseudoealycoceras, Eucalycoceras and Neocardioceras of the Acanthoceratinae, Euomphaloceras of the Euomphaloceratinae, Metoicoceras of the Mammitinae and Vascoceras of the Vascoceratidae. © 1994 Academic Press. All rights reserved

A revision of the ammonite faunas of the type Cenomanian. i. Introduction, ancyloceratina

This paper forms the first part of a revision of the ammonite faunas of the Cenomanian stratotype in the environs of Le Mans, Sarthe, France. The history of research on ammonites in the area is briefly noted, as is the lithostratigraphy. The systematics of the heteromorph ammonites (Ancyloceratina) is described, and the following taxa documented: Hamites simplex d'Orbigny, Sciponoceras baculoides (Mantell), Sciponoceras gracile (Shumard), Anisoceras plicatile (J. Sowerby), A. aff. plicatile, Idiohamites alternatus vectensis Spath, I. ellipticus radiatus Spath, Hypoturrilites gravesianus (d'Orbigny), H. tuberculatus (Bosc), H. mantelli (Sharpe), H. sp., Neostlingoceras carcitanense (Matheron), N. aff. carcitanense, Turrilites costatus Lamarck, T. acutus Passy, T. scheuchzerianus (Bosc), T. boerssumensis Schlüter, Mariella dorsetensis (Spath), M. cenomanensis (Schlüter), M. group of cenomanensis (Schlüter)-lewesiensis (Spath), M. spp., M. (Plesioturrilites) sp., Scaphites equalis J. Sowerby, S. obliquus J. Sowerby, S.(?) sp., and S. sp. juv. © 1983

Sur la présence de poudingues à la base du minerai de fer ordovicien dans le synclinal de Ranville

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A revision of the ammonite faunas of the type Cenomanian. 3. Mantelliceratinae

This contribution continues the revision of the ammonite faunas of the type Cenomanian, dealing with the Mantelliceratinae, the dominant Lower Cenomanian representatives of the Acanthoceratacea. Seven species of the genus Mantelliceras Hyatt, 1903 and one of the genus Sharpeiceras Hyatt, 1903 are described. © 1986

Uppermost Cenomanian ammonites from Eure, Haute-Normandie, northwest France

Temporary exposures of chalks spanning the Cenomanian - Turonian boundary to the east of Brionne, Eure, Haute-Normandie, France, yielded well-preserved ammonite faunas. The Metoicoceras geslinianum Zone assemblage is: Pseudocalycoceras angolaense (SPATH, 1931), Sumitomoceras cautisalbae (WR1GHT and KENNEDY, 1981), Calycoceras (Calycoceras) sp. juv., Eucalycoceras pentagonum (JUKES-BROWNE, 1896), Euomphaloceras septemseriatum (CRAGIN, 1893), Metoicoceras geslinianum (D'ORBIGNY, 1850), Hamites cimarronensis (KAUFMANN and POWELL, 1977), Allocrioceras annulatum (SHUMARD, 1860), and Sciponoceras gracile (SHUMARD, 1860). The succeeding Neocardioceras juddii Zone assemblage is: Thomelites serotinus WRIGHT and KENNEDY, 1981, Neocardioceras juddii juddii (BARROIS and GUERNE, 1878), Neocardioceras juddii barroisi WRIGHT and KENNEDY, 1981, and Thomasites gongilensis (WOODS, 1911). Imprecisely localised are Pachydesmoceras sp., and Nigericeras aff.scotti COBBAN, 1972. The majority of the species are new for northern France, and confirm the northwards extension of typically Tethyan taxa (Thomasites, Nigericeras) into the Boreal region during the uppermost Cenomanian, and previously recognized in southern England, as well as the occurrence of cosmopolitan acanthoceratids well-known at this level in the United States (Pseudocalycoceras, Sumitomoceras)