Charles Henry Smyth Jr.

Charles Henry Smyth Jr.
Smyth in an undated photo
Born	(1866-03-31)March 31, 1866 Oswego, New York, United States
Died	April 4, 1937(1937-04-04) (aged 71) Princeton, New Jersey, United States
Citizenship	United States
Alma mater	Columbia University
Children	Charles Phelps Smyth Henry DeWolf Smyth
Scientific career
Fields	Geology
Institutions	Hamilton College Princeton University
Thesis	The Origin of the Clinton Type of Iron Ore  (1890)
Doctoral advisor	James Furman Kemp Nathaniel Shaler
Other academic advisors	Harry Rosenbusch
Doctoral students	Arthur Francis Buddington

Charles Henry Smyth Jr. (/smaɪθ/;^[1] March 31, 1866 – April 4, 1937) was an American geologist. Born to a prominent family in Upstate New York, he studied geology at Columbia University before becoming a professor of geology at Hamilton College and Princeton University. At Princeton he strengthened the Department of Geology's graduate program.

Smyth specialized in petrology, chemical geology, and economic geology. He showed the sedimentary origin of iron ore deposits near his native Clinton, New York, mapped the geology of the western Adirondack Mountains, and published a well known monograph on the origins of alkaline igneous rocks. He was a fellow of the American Association for the Advancement of Science, a member of the American Philosophical Society, and a fellow of the Geological Society of America.