Ages obtained on the Mount Melbourne volcanic field include 2.96±0.2 million years, 740,000±100,000 years and 200,000±40,000 years for Baker Rocks, 2.7±0.2 million years and 450,000±50,000 years for Cape Washington, 74,000±110,000 years and 50,000±20,000 years for Edmonson Point, less than 400,000 years for Markham Island, 745,000±66,000 years for Harrows Peak, 1,368±0,09 million years for Pinkard Table, 1.55±0.05 million years, 431,000±82,000 and 110,000±70,000 years for Shield Nunatak, and 2.5±0.1 million years for Willows Nunatak. The northeastern parasitic cone formed after the bulk of the volcano and appears to be younger than the summit of Mount Melbourne.