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Research-paper

The sequence of ammonite correlated horizons in the British Sinemurian (Lower Jurassic)

Page, Kevin N.

Newsletters on Stratigraphy Volume 27 Number 3 (1992), p. 129 - 156

published: 12/18/1992

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Abstract

The meaning and usage of Horizons is discussed and then applied to the Sinemurian (Lower Jurassic) sequence within the Lower Lias Group of the British Isles. These rocks are of fundamental importance in Lower Jurassic stratigraphy and have yielded the type specimens of 15 of the 20 zonal and subzonal indices of the North-West European Standard for the Sinemurian Stage. By the recognition of Horizons a three-fold increase in the resolution of the ammonite-correlated "time-scale" or Standard Zonation for the Sinemurian is possible (with 61 potentially correlatable horizons identifiable within 17 established subzones). Comparisons and correlations with early and recent detailed subdivisions of the Sinemurian Stage are discussed.