He was best known for his work on rocks of Carboniferous age and was awarded the Murchison Medal of the Geological Society of London in 1950.
During World War 1, he served in France with the Royal Army Medical Corps.
After the war, Eastwood returned to work on the mineral resources of the United Kingdom.
He was posted to the new Cumberland unit of the geological survey in 1922, where he joined Bernard Smith, Frederick Murray Trotter, Ernest Dixon and Sydney Ewart Hollingworth, among others.
[3] In 1965, Eastwood donated a collection of his books, maps and reports to start the library of the Cumbria Geological Society.