Breda Formation Formation. The Breda Formation can be a couple of meters to (in the Roerdal Graben) more than thick. The top is formed by an erosional nonconformity in the south and east of the Netherlands. In the west the contact with the Pliocene Oosterhout Formation is more gradual. In the Roerdal Graben the mostly Pliocene Kiezeloolite Formation is sometimes on top of the Breda Formation. Locally the Breda Formation can be subdivided into members: the Aalten Member (silty calcareous clay, rich in shells), the Eibergen Member (clay alternating with thin sand layers, with a basal conglomerate in which shark teeth and
Siege of Breda (1624) with modern defences. Thus, in 1531 he inspired the construction of the late medieval style walls of Breda. These were later replaced by modern fortifications. In 1587 and 1622, the defences were further expanded and updated. The Breda fortress consisted of a very high earthen thoroughfare with 15 bastions and a moat. The 55 to 117 meter wide canal was five feet deep and was provided with water from Mark. Access to the city was made possible by four brick gates. Crescent ravelins were applied in the ditches. Hornwork was placed on the gates and at the . Stakewall were