Pollen analysis of a coastal peat deposit at Colleville-sur-Mer, Normandy, France, and examination of the molluscan fauna of interstratified beds, shows that the peat is postglacial in age. Discontinuity of the peat and interbedded layers is due to slumping and sliding of calcareous mud derived by alteration of Jurassic Bradfordian deposits overlying Vesulian clays.

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