Lower Cretaceous ammonites from the Neuquén Basin, Argentina: Viluceras , a new Valanginian subgenus ofOlcostephanus

Author: Aguirre-Urreta M.B.   Rawson P.F.  

Publisher: Academic Press

ISSN: 0195-6671

Source: Cretaceous Research, Vol.20, Iss.3, 1999-06, pp. : 343-357

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Abstract