In 1831 he went to the
England–Wales border, to attempt to discover whether the
greywacke rocks underlying the
Old Red Sandstone could be grouped into a definite order of succession. The result was the establishment of the
Silurian system under which were grouped, for the first time, a remarkable series of formations, each replete with distinctive organic remains other than and very different from those of the other rocks of England. These researches, together with descriptions of the
coalfields and overlying formations in
South Wales and the
English border counties, were embodied in
The Silurian System (1839). The English naturalist, geologist, and palaeontologist
John William Salter assisted Murchison in his work on Siluria (1854 and later editions). The establishment of the Silurian system was followed by that of the
Devonian system, an investigation in which Murchison assisted, both in the south-west of England and in the
Rhineland. Soon afterwards Murchison projected an important geological campaign in Russia with the view of extending to that part of the Continent the classification he had succeeded in elaborating for the older rocks of western Europe. He was accompanied by
Édouard de Verneuil (1805–1873) and Count
Alexander von Keyserling (1815–1891), in conjunction with whom he produced a work on Russia and the
Ural Mountains. The publication of this monograph in 1845 completes the first and most active half of Murchison's scientific career. He was elected a Foreign Honorary Member of the
American Academy of Arts and Sciences in 1840. and he was president 1843–1845, 1851–1853, 1856–1859 and 1862–1871. He served on the
Royal Commission on the British Museum (1847–1849). Murchison also
announced the Permian system to geology in 1841, based on explorations in
Perm Krai undertaken with Édouard de Verneuil. Murchison was responsible for establishing much of the international prestige of British geology, and he viewed the spread of his stratigraphic systems on maps around the world "as a scientific form of imperial expansion". He frequently described geological excursions (such those he made abroad) as "invasions" or "conquests" and enjoyed being dubbed the "King of Siluria". According to the scholar Robert A. Stafford, "Murchinson's tendencies towards
militarism,
imperialism, and
megalomania ran through his career and finally found full expression his simultaneous leadership of the Royal Geographical Society and the British Geological Survey." ==Scotland==