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'''Base''': The base of the zone is defined by the first appearance of the index species (Gale, 1996).
'''Correlation''': The zone is presumably equivalent to the ''C. woollgari'' Zone of Wright & Kennedy (1981), and it equates with the upper ''Mytiloides'' spp. Zone and most of the ''T''. ''lata'' Zone of the standard macrofossil zonal scheme.
'''Occurrence''': Well-horizoned material occurs in the BGS Fetcham Mill Borehole [TQ 1581 5650], where the index occurs c, 22.8 m above the Melbourn Rock, and at Fognam, Berkshire, where it occurs c. 5 m below the Chalk Rock (Wright & Kennedy, 1981).
[[Category:International ammonite zonation for the Turonian & Early Coniacian | 004]]

Latest revision as of 10:49, 30 September 2013