Abstract
GLAUCONITE grains are scattered through the arenaceous facies of the English Wealden (pre-Aptian Cretaceous). They become sufficiently abundant to form dark laminae and beds of ‘greensand’ at two horizons: (1) top Ashdown Sand; (2) top Lower Tunbridge Wells Sand (Fig. 1). Above and below, the facies is non-marine, sometimes freshwater. Little palaeosalinity evidence is available from the sandstones themselves. Some of the glauconite grains have recalled abraded foraminiferal casts1. At present the balance of evidence favours derivation from older marine sediments. These could have been either Upper Jurassic or pre-Upper Carboniferous.
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