Although the Republic of Venezuela adjoins two British colonies, only some three or four papers have been published in English journals dealing with the geology of the country. These, moreover, are concerned with local observations, and no attempt at correlation has been made. A considerable mass of material is available in Continental publications, and the author, during a series of journeys through Northern Venezuela in 1910, was able to collect sufficient data to form a fairly clear idea of the successien of deposits, and to roughly correlate the views of different writers. While more compilatory than original, the following paper is offered as a basis for further study of the geology of an area so closely connected with the colonies of British Guiana and Trinidad, and the short bibliography includes all those papers bearing directly on the subject which are known to the author.