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In sections of the Achdorf Formation at the Wochenberg hill (western Swabian Alb, SW Germany), a succession of five ammonite biohorizons is distinguished (from bottom to top): thecrassicostatum    andviallii    biohorizons of the Lower Aalenian (Bifidatum Subzone, Opalinum Zone) and thelatiumbilicus   ,discoidea    α anddiscoidea    β biohorizons of the Upper Aalenian (Murchisonae Subzone, Murchisonae Zone). The herein newly introducedviallii    biohorizon is the youngest hitherto identified biohorizon of the Opalinum Zone (Bifidatum Subzone). A lectotype is designated for    Staufenia   latiumbilicus    (Quenstedt, 1886), the index ammonite of thelatiumbilicus    biohorizon. The succession of biohorizons of the Murchisonae Subzone reflects the evolution of the graphoceratid late Aalenian ammonite genera    Staufenia    and    Ludwigia   .

zitteliana

﻿  Ammonites   and stratigraphy of the Achdorf Formation (Braunjura Group; Aalenian) at the Wochenberg hill near Schömberg-Schörzingen (W Swabian Alb, SW Germany)

﻿ Ammonites and stratigraphy of the Achdorf Formation (Braunjura Group; Aalenian) at the Wochenberg hill near Schömberg-Schörzingen (W Swabian Alb, SW Germany)

Ammonites and stratigraphy of the Achdorf Formation (Braunjura Group; Aalenian) at the Wochenberg hill near Schömberg-Schörzingen (W Swabian Alb, SW Germany)