BGS Zone 3 (=UKB4 of Hart et al., 1989)

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Base: The extinction of Marssonella ozawai and Quinqueloculina antiqua.

Top: The inception of Flourensina mariae and Plectina cenomana.

Biomarkers:

  • Lingulogavelinella jarzevae becomes extinct in the basal part (lower to middle M. dixoni macrofaunal zone).
  • Rotalipora reicheli appears for the first time in the upper part of the zone (upper M. dixoni macrofaunal zone), but is rare.

Macrofaunal correlation: M. dixoni Zone.

Age: Early Cenomanian