From 15 August 1854 he worked at
Roorkee, making trips with
Thomas Oldham. He married Louisa, daughter of Reverend Daniel Henry Maunsell, at Landour near Mussoorie on 27 October 1857. In 1857 he served as a volunteer with the garrison of Roorkee against the mutineers and was awarded the
Indian Mutiny Medal for Special Service. While at Roorkee, he studied parts of the Narmada Valley and Bundelkhand (in 1854–55 and 1856–57). He worked on the geology of the Lower Himalayas and the Siwalik Beds. Along with his brother
Joseph G. Medlicott, he was able to determine the separation of the Cambrian Vindhyan region from the Gondwana. He later worked in various parts of the country such as South Rewa, Bihar, Assam, Khasi Hills, Rajputana, Kashmir, the Satpura ranges and the Garo Hills. On 1 April 1876 he succeeded Dr Oldham to head the Department of Geology and was posted in Calcutta. The position was changed from Superintendent to Director in 1885. Medlicott began to isolate himself from social life and began to live an ascetic life, walking barefoot and editing papers. He wrote
Manual of the Geology of India with
William Thomas Blanford in 1879 and edited works in the
Paleontologica Indica. His writing style was considered intemperate by his contemporaries but he began a policy to allow his subordinates free expression in print, a move that caused resentment among the staff. He was hostile to the promotion of native Indian geologists. He was elected a
Fellow of the Royal Society in 1877 and won the
Wollaston Medal of the
Geological Society in 1888. He was a Fellow of Calcutta University, and from 1879 to 1881 he was President of the Asiatic Society of Bengal. == Later days ==