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

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