Several volcanic features in the Mount Cayley field were illustrated by volcanologist Jack Souther in 1980, including Mount Cayley, Cauldron Dome, Slag Hill, Mount Fee, Ember Ridge and Ring Mountain, which was titled Crucible Dome at the time. This resulted in the creation of a geologic map that showed the regional terrain and locations of the volcanoes. The most detailed study of Mount Cayley took place during this period. Little Ring Mountain at the northernmost end of the field had not been studied at the time and was not included on Souther's 1980 map. Ember Ridge at the southern end of the field was originally mapped as a cluster of five lava domes. The sixth lava dome, Ember Ridge Northeast, was discovered by Ph.D. student Melanie Kelman during a period of research in 2001.