Ida Lilian Slater (1881-1969) was one of the first women to work as a geologist in a male world, and although her career was short, she made important contributions to the Early Palaeozoic of Wales and Scotland. Her main work was based on a collection of a group of fossil scypho-zoan polyps gathered not by her but by another significant woman, Elizabeth Anderson, widely known as Mrs. Robert Gray (1831-1924). The majority of this collection is kept at the Natural History Museum (NHM), London, and the Sedgwick Museum, Cambridge. She worked in the former one for two years describing species and comparing specimens for her monograph on British conulariids. Although her work was based not only on this group, she will be remembered by her important contribution to the conulariids through collections. The NHM collection is considered the best in the world in terms of diversity and the second best in its number of specimens, while the Sedgwick Museum has a smaller collection that is still considered the second best in diversity and number of specimens in the United Kingdom. Her work has been cited for more than 100 years and continues to be cited to this day by researchers on this group of fossils.
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