John Eiler, Robert P. Sharp Professor of Geology and professor of geochemistry at Caltech, has been awarded the 2012 Arthur L. Day Medal by the Geological Society of America (GSA).

Arthur Louis Day established the award in 1948 for "outstanding distinction in contributing to geologic knowledge through the application of physics and chemistry to the solution of geologic problems."

Eiler will receive the medal at the GSA's annual meeting, which will be held November 4–9 in Charlotte, North Carolina.