BGS Zone 17 (=lower and middle UKB14 of Hart et al., 1989)

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Base: Inception of Stensioeina granulata polonica

Top: Inception of Gavelinella cristata.

Biomarkers:

  • Reappearance of Reussella kelleri immediately above Whittaker’s 3” Flint and lateral equivalents.
  • 'Extinction of Lingulogavelinella arnagerensis a little above Whittaker’s 3” Flint and lateral equivalents.

Subzones:

17i. Inception of Stensioeina granulata polonica (Chartham Flint and lateral equivalents) to the inception of Cibicides beaumontianus.

17ii. Cibicides beaumontianus inception at Whittaker's 3” Flint and Rough Brow Flint and lateral equivalents, to the inception of Reussella szajnochae praecursor.

17iii. Reussella szajnochae praecursor inception above Barrois Sponge Bed and lateral equivalents to the top of the zone.

Macrofaunal correlation: Upper M. coranguinum Zone (Chartham Flint to immediately below Peake’s Sponge Bed).

Age: Santonian