A count of articles by women listed in the Catalogue of Scientific Papers, 1800–1900, the nineteen-volume international index brought out by the Royal Society, produced a collection of almost 4000 titles of papers by about 1000 nineteenth-century women authors. Out of 181 geology papers in this collection, 118 (65 per cent) were by British women (see Table 1, columns 1 and 2). This finding is especially remarkable when considered against the more general background of nineteenth-century women's work in science (at least as judged from women's contributions to the journal literature indexed by the Royal Society). In most fields American workers considerably outnumbered British and published many more papers. Geology, however, is an exception, with the British dominating the field by a wide margin. This essay discusses a number of the British women of the period who carried out work in geology, and offers some suggestions that go toward explaining their striking prominence among their contemporaries.