A notable product of the geologic work of Roderick Murchison was the geologic map accompanying the landmark book The Geology of Russia in Europe and the Ural Mountains (John Murray, 1845). Much of that map resulted from extended field campaigns undertaken by Murchison and colleagues in Russia in 1840 and 1841. Other portions of the map were compiled between 1842 and 1845 based on additional trips made to Poland and Scandinavia. The production of this comprehensive map was made possible by a fieldwork methodology that Murchison had developed and used throughout his career. The methodology comprised research and correspondence in advance of a trip, assembly of publications and maps covering the area to be investigated, networking with local experts and examination of their fossil collections and geologic maps, traveling with other geologists to collaborate on fieldwork, detailed record-keeping of observations, and prompt announcement of results both at meetings and in print. A good example of this methodology in action is Murchison’s fieldwork in Sweden. In 1844 Murchison traveled to southern Sweden and documented the occurrence of Lower Silurian fossiliferous sedimentary rocks resting unconformably on crystalline basement. He made those observations at Kinnekulle and the Billingen Hills whilst traveling with the Swedish geologist, Sven Loven. Together with Edouard de Verneuil, Murchison returned to Sweden in 1845 and their itinerary was strongly influenced by Wilhelm Hisinger’s geologic map. During that summer, they traveled to Lake Siljan, the island of Gotland, and the southern coast of Sweden. They recognized both Lower and Upper Silurian rocks at these localities and were able to correlate the much thinner rock units of Sweden to equivalent, but thicker, rock units in Britain based on similar fossil content. They were the first to apply the modern system name Silurian to these rocks that until then had been known only by Swedish names of local significance. Many of their findings were first announced at the Geological Society. Part of the Swedish work was published in The Geology of Russia (1845); additional papers on drift and bedrock geology were published in the Quarterly Journal of the Geological Society. Collaborating geologists benefited from interacting with Murchison and they typically remained on good terms long after the work was completed.