(Riedel and Sanfilippo, 1978a)
The top of the zone is defined by the morphotypic first appearance of Stichocorys wolffii and is coincident with the lower limit of the Stichocorys wolffii Zone.
The lower limit of the zone is approximately synchronous with the following events:
- Bm Didymocyrtis tubaria; Bm Didymocyrtis violina; Bm Stichocorys delmontensis; Bm Carpocanopsis bramlettei
The base of the zone is defined by the morphotypic last appearance of Theocyrtis annosa and is coincident with the upper limit of the Cyrtocapsella tetrapera Zone.
Reference slides R 24.1, R 24.2 and R 24.3 from Sample 85-573B-153, 61-63 cm.; R 25.1, R 25.2 and R 25.3 from Sample 85-573B-15-CC; R 26.1, R 26.2 and R 26.3 from Sample 85-573-16-CC.