Archaeological monuments. From earliest prehistory to the present, the inhabitants have left their traces in the soil of Overijssel. This soil archive is an important and the only source of information for prehistory. On the basis of remnants of the past, such as pottery shards, (flint) stone axes or discolorations in the soil of, for example, farm posts, it is possible to tell something about the people and their way of life in the past. This soil archive is very vulnerable: the remains are usually close to the surface. Moreover, the soil archive can only be consulted once: once something has been excavated, it is gone forever. This map shows the Archaeological Monuments (AMK) of the National Cultural Heritage Agency (RCE) Archaeological Monuments Care Act. The Archaeological Monuments Care Act came into effect on September 1, 2007. This implies a far-reaching amendment to the 1988 Monuments and Historic Buildings Act. As of 1 September 2007, archaeological values are subject to a legal obligation based on the amended 1988 Monuments and Historic Buildings Act to take into account the monuments present or to be expected in the ground when adopting a zoning plan ( Article 38a).