Przybylski, Piotr A.; Ogg, James G.; Wierzbowski, Andrzej; Coe, Angela L.; Hounslow, Mark W.; Wright, John K.; Atrops, François and Settles, Erik
Magnetostratigraphic correlation of the Oxfordian-Kimmeridgian boundary.
Earth and Planetary Science Letters, 289(1-2),
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A magnetic polarity pattern for Boreal and Sub-Boreal ammonite zones of the Upper Oxfordian to Lower
Kimmeridgian was established and confirmed in four British sections, including the proposed Global
Boundary Stratotype Section and Point (GSSP) on the Isle of Skye (Scotland) to define the base of the
international Kimmeridgian Stage. A coeval pattern for Sub-Mediterranean ammonite zones was compiled
from seven sections in Poland, one German section and multi-section composites from France and Spain. The
mean paleopole for the European Craton (excluding Spain) at the Oxfordian–Kimmeridgian boundary is
74.2°N, 181.3°E (Α95=3.8°). The common magnetic polarity scale enables inter-correlation of ammonite
subzones among these three faunal provinces and to the marine magnetic-anomaly M-Sequence. The
proposed GSSP at the base of the Pictonia baylei Zone is near the base of an extended interval dominated by
reversed polarity, which is interpreted to be Chron M26r. This GSSP level projects to the lower to middle part
of the Epipeltoceras bimammatum Subzone, which is the middle subzone of this E. bimammatum Zone in the
Sub-Mediterranean standard zonation. In contrast, the traditional placement of the Oxfordian–Kimmeridgian
boundary in that Sub-Mediterranean standard zonation (base of Sutneria platynota Zone) is at the base of
Chron M25r, or nearly 1 million years younger.
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