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Additional resources for Étude biostratigraphique des ammonites du centre et de l’est du Mexique (Jurassique supérieur et Crétacé)

Sample text

Bassin pétrolier de Poza Rica (Etat de Veracruz). - AGE : K i m m e n d p e n inférieur. Sous-famille Aulacostephaninae GÉNÉROTYPE : SPATH 1924 Genre Pararasenia Aulacostephanus zacatecanus par désignation de Spath BURCKHARDT PL. II, 1906. 1956. 1957. 67-68; pl. XVI, fig. 1925 1-4] [1925]. Pararasenia aff. zacatecana 1925. [p. SPATH fig. (BURCKHARDT) 11. Aulacostephanus zacatecanus BURCKHARDT [p. 67-68, pl. XVI, fig. 1 - 4 ] . ) in Spath. P. ) in Arkell [p. 5 6 3 ] . P. ) in Arkell [in Moore, p.

Aulacostephanus zacatecanus BURCKHARDT [p. 67-68, pl. XVI, fig. 1 - 4 ] . ) in Spath. P. ) in Arkell [p. 5 6 3 ] . P. ) in Arkell [in Moore, p. L 326-327, flg. 4 1 9 , 7 a-b]. Echantillon n° 17 : petit morceau d'une empreinte d'Ammonite, inclus dans une carotte de sondage, qui montre des côtes naissant sur le bord ombilical à partir de tubercules aplatis; elles se divisent immédiatement en deux côtes secondaires, élargies et aplaties au milieu du flanc, où elles s'affaiblissent; sur le tiers externe, elles se divisent à nouveau en deux petites côtes saillantes, les intervalles sont de même largeur que ces dernières.

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