A Review of the Jurassic of Western Sicily Based on New Ammonite Faunas

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Summary: The first part of the paper gives descriptions and profiles of four key Jurassic sections in western Sicily from which ammonites have been collected at various levels, and discusses the stratigraphy and the relations of the Jurassic to earlier and later systems. It is shown that thick limestones previously classed as Tithonian belong largely to the Cretaceous and in places are even Eocene. The tectonic implications are discussed. The second part of the paper lists 11 assemblages of ammonites collected in the four sections and ranging in age from Lower Bathonian to Tithonian. Notes on their correlation and òn a number of other assemblages collected in Sicily are also given. Lower and Upper Bathonian and Lower and Upper Oxfordian assemblages new to Sicily are recorded. The Jurassic palaeogeography of Sicily and neighbouring regions is inferred from the vertical and horizontal distribution of the ammonite faunas and their affinities with those in other regions. Part I. Structure and Stratigraphy [H. R. W.] I. Introduction The field work on which this paper is based was carried out in routine geological investigations on behalf of the D'Arcy Exploration Company during exploration for oil. Acknowledgment is made to the Chairman and Directors of the Anglo-Iranian Oil Company Ltd., of which the D'Arcy Exploration Company is a subsidiary, for permission to publish the following results deriving from these investigations. In an attempt to amplify our knowledge of the regional stratigraphy, certain major exposures of pre-Tertiary rocks in western Sicily have been examined and the thicknesses

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