The top of the zone is defined by the evolutionary transition from Podocyrtis mitra to Podocyrtis chalara and is coincident with the lower limit of the Podocyrtis mitra Zone.
Events included in the zone are:
- Tm Eusyringium lagena; Bm Artophormis barbadensis; Bm Thyrsocyrtis lochites; Bm Sethochytris triconiscus; Tm Podocyrtis fasciolata; Tm Podocyrtis helenae
The base of the zone is defined by the evolutionary transition from Podocyrtis sinuosa to Podocyrtis mitra and is coincident with the upper limit of the Podocyrtis ampla Zone.
Reference slides R41.1, R41.2 and R41.3 from Sample 10-94-17-1, 121-128 cm.