Subprionocyclus neptuni Zone

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Base: The base of the zone is defined by the first appearance of the index species (Gale, 1996).

Correlation: The presumably correlative lower part of this zone was described by Wright & Kennedy (1981). The zone equates with the upper T. lata and S. plana zones of the standard macrofossil zonal scheme.

Occurrence: The zone has been recognised in southern England, Hertfordshire and Berkshire (Gale, 1996).


Subzones: Subprionocyclus normalis
Subprionocyclus neptuni
Romaniceras deverianum
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