BGS Zone 25 (=UKB21 of Hart et al., 1989): Difference between revisions
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'''Base: '''Inception of ''Bolivinoides paleocenicus''. | '''Base: '''Inception of ''Bolivinoides paleocenicus''. | ||
Latest revision as of 12:07, 1 October 2013
Base: Inception of Bolivinoides paleocenicus.
Top: Inception of Bolivinoides draco draco (not seen onshore, but present in the North Sea Basin).
Biomarkers:
- The Trimmingham Sponge Beds Member and Little Marl Point Member contain Angulogavelinella bettenstaedti together with B. paleocenicus.
- Pseudouvigerina rugosa and Tappanina selmensis appear in the upper part of the Little Marl Point Chalk (‘lunata Beds’ of Peake & Hancock, 1961, 1970) and Beacon Hill Grey Chalk (‘Grey Beds’ of Peake & Hancock, 1961, 1970).
- In the North Sea succession, Hedbergella monmouthensis appears in the upper part of the foraminifera zone.
Macrofaunal correlation: lower B. occidentalis Zone s.l.
Age: Maastrichtian