Portlock, Joseph E.; Report on the Geology of the County of Londonderry and of Part of Tyrone and Fermanagh (Ireland). Dublin & London, 1843. Quarto, pp. xxxi, errata, 784, large folded hand-colored geological map, 45 lithograph plates of fossils, 9 folded plates (5 being hand-colored profiles).

The volume is complete and in the original light brown cloth with gilt titles. The binding has been re-cased with a later matching spine and original spine laid over.  Scuffing to boards, titles bright, text clean.
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Portlock was an English soldier who rose to the rank of Major-General, topographer and geologist. In 1824 he inaugurated the work of the British Ordinance Survey in Ireland and made major contributions to the stratigraphy of Ireland. This new survey did not diminish in the least the earlier work of the Irish geologist Richard John Griffith who published the first definitive geological map of Ireland. Portlock's work marked the end of the geological branch of the Ordinance Survey in Ireland. The work is considered a masterpiece in which one author combined the areal geology and palaeontological features. His descriptions of the characteristics of Ireland's Silurian fossils (which included those of what we now know as Ordovician) linked species to those of Great Britain as well as those of the continents of Europe and North America. The work is a milestone in Irish geology and is seldom seen in such fine condition.