1995  Bogoslovskaia, Leonova & Shkolin: 290, fig.2:
           Airdaralash Creek section, with ammonoid occurrences
           and bed numbers.

           No.0 --> 19: Orenburgskian; 19-20: C-P boundary; 20-->
           33: Asselian; 33-->36: Sakmarian. Boundary
           Asselian/Sakmarian undefined within bed no.33.

----> LOC6386: Bogoslovskaia, Leonova & Shkolin, 1995, fig.2.