Ida Lilian Slater (1881–1969)[1] was a British geologist who made important contributions to the study of conulariids.
She was one of four children of Mary Emily Wilkins and John Slater, a fellow of the Royal Institute of British Architects.
[2] Slater and Helen Drew arrived at Newnham College, Cambridge in 1900 to study geology as part of their degrees.
[3] Part of her development as a geologist was gained at the Club[2] where she was a member from 6 May 1902 until 1905, and was their honorary secretary from mid-1903 until 9 February 1904.
In 1910 Slater published the results of her research into the Palaeozoic of Wales jointly with Helen Drew.