[3] Prior to that, in 1907, a decision was made by the Society to admit women as Associates, under the condition they distinguished themselves as geological investigators or submitted their own original research.
[2] Crosfield kept meticulous ordered notebooks and field specimens, some of which are kept at the British Geological Survey in Keyworth, Nottingham.
[5] Crosfield was an active campaigner for Women's suffrage,[7] and often lectured local societies on social issues, as well as scientific topics.
[6] Margaret's brother and father were two of the founders of Harrison & Crosfield, which started as a tea merchant company and is now called Elementis.
[12] Crosfield also was known to work with Gertrude Elles and Dame Ethel Shakespear by identifying and verifying fossil specimens that were collected on various field campaigns.
[2] In her paper on Carmarthen, Crosfield surveyed four miles around the town and discovered syncline, collecting new species of trilobites.
The objective in examining this district was to trace the continuation of the complex anticline which was discovered by the late Mr. T. Roberts, about 10 miles west of Carmarthen.
[13] In 1906, along with Skeat and under the direction of Professor John Marr, Crosfield examined the "little-known series of Denbighshire Grits and Flags in the Clwydians, in order to establish a sequence by means of the graptolite fauna".
[citation needed] In 1914, she surveyed Wenlock limestone for Proceedings of the Geological Association with M.S Thompson and provided an account for C.E Salmon's publication on Surrey's flora.
[citation needed] Crosfield was widely renowned for her intricate geologic notes and her meticulous organization of the vast array of field specimens that she had collected over the years.
Margaret Crosfield was able to self-fund her research due to the inheritance of her father's wealth,[7] and was not employed by a University or College.
In 1906 Professors McKenny Hughes, and Marr of the University of Cambridge along with Professor Lapworth of Mason Science College initiated a small group of woman including Margaret Crosfield and Ethel Skeat to research the Silurian and Ordovician rock of North Wales and the borders to solve the "Silurian problem".
[15] Margaret surveyed a four-mile radius around Carmarthen and while examining the syncline she discovered new features of stratigraphy and also collected a new species of trilobite.