[2] Whilst at Bedford, she studied under two of the most famous female geologists of the time, Catherine Raisin and Gertrude Elles, who encouraged her interest in petrology.
[3] Her early work focused on the geology of Northern Ireland, in particular the Triassic sandstones of the north-east, where she discovered authigenic potash feldspar.
Whilst conducting field work on the island of Colonsay, she discovered that the local xenoliths of quartzite in hornblendite were transformed metasomatically into micropegmatite.
[3] During a field trip with some students to the Ardnamurchan Peninsula in 1931, Reynolds met Arthur Holmes, the Professor of Geology at the University of Durham.
[2] Holmes died in 1965 and Reynolds went on to publish the revised third edition of his classic textbook Principles of Physical Geology in 1978.