Correlation, age and significance of Turonian Chalk hardgrounds in southern England and northern France: The roles of tectonics, eustasy, erosion and condensation

The stratigraphy and correlation of middle and upper Turonian hardgrounds developed around the margins of the Anglo-Paris Basin in southern England (Chalk Rock) and Normandy (Tilleul Hardgrounds) are reassessed using microcrinoid stratigraphy. The Chalk Rock was formed by two, discrete events – an earlier, erosional or non-depositional hiatus that cuts out much of the middle Turonian in Dorset and Wiltshire (Ogbourne Hardground) and extends...