Sedimentary geology of the Holocene in lake IJssel region

Abstract

Topics of the Holocene sedimentary geology based upon detailed investigations in the third polder of the Zuyderzee project are presented. They comprise distribution, composition and dating of sediments of the Calais-transgression phases, strongly bound to the evolution of the western Netherlands. Mainly after the first Duinkerke-transgression phase the development evolves towards a separate history of the Zuyderzee. Its evolution from a complex of lakes towards a brackish-saline lagoon is shown by the described sediments of different composition. The development of the delta of the river lJssel is brought into relation with that of the lagoon. The displacement of sands along the coast by wind/wave effects is shown, together with the phenomenon of numerous megaripples present at. the edges of the sand masses.