This paper contains the Dutch translation of a report on the geology of the provinces North-Holland and Utrecht, written in 1813 by Dr Martinus van Marum for the Governor of these provinces, A. P . F .G. Visscher de Celles. The original is written in French. An English translation will be published in Volume III of 'Martinus Van Marum, Life and Work' (Haarlem, 1971).