units A and B were from the Guadalupian
age, C-D from the Dzulfian age, E transitional stages, F a Paratirolites horizon with early Triassic age and H and G introduced the Elika Formation in to the section being studied.
Clarkina crofti appears to exhibit a high potential for the correlation of the post-Lamar/pre-Castile level of the Guadalupian type area with deepwater deposits of Tethys origin.
1993), allowing the exact correlation of the upper boundary of the Capitanian (and by this of the upper boundary of the Middle Permian Guadalupian Series) with the Tethyan scale as established in South China.
The Clarkina features developed within the different lineages at slightly different times during the late Guadalupian or at the end of the Guadalupian (Capitanian/Dzhulfian or Wuchiapingian boundary).
crofti fauna are very different from the Mesogondolella faunas of the Middle Permian Guadalupian Series that are characterized by serrated Mesogondolella of the M.
nankingensis (Ching) is likewise placed within one genus, and there is now a general agreement that this world-wide traceable event is the best marker for the base of the Guadalupian Series (Glenister et al.
This gondolellid fauna without serrated conodonts is very different from the Guadalupian conodont fauna with serrated conodonts (Kozur 1978; 1992b; 1992c; 1992d).