La recherche sur les cartes geologiques a eu tendance a insister sur les details cartobiblographiques, et a laisser de cote les influences historico-scientifiques. The problems arising from the lack of accurate topographic maps of suitable scale and accuracy are discussed and an attempt made to correlate the geological maps with the attendant growth in knowledge of Arran's geology. In this paper, a review is made of the geological maps of the Isle of Arran over the period of fifty years which followed the publication of the earliest map of the island in 1807.
Research on geological maps has tended to stress the cartobibliographical details whilst ignoring the historical-scientific influences. Upon the death of King Frederik VI, Denmark abandoned its African colonial ambitions: Peter Thonning's map was finally laid before the British government, and the Danish colonial possessions in Africa passed under British rule in 1850. The map can be traced through the Danish archives into the hands of kings, ministers, diplomats, and colonial officers on the ground in Africa. Thonning's career carried him into the colonial administration in Copenhagen, and he deployed his map repeatedly, over the course of decades, in support of his efforts to persuade the government to expand the Danish colonial presence in West Africa. This unusually rich and large-scale map was compiled by a natural historian named Peter Thonning, who had no prior experience with making maps and no connection to Danish cartographic institutions. The cartographic record of Denmark's one-hundred-and-eighty-year colonial adventure on the Guinea Coast is completely dominated by more than a dozen manuscript versions and copies of a single map of the Danish African enclave sent in to the central colonial administration from Africa in 1802.
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