Jack Sepkoski
J. John Sepkoski Jr., (July 26, 1948 - May 1, 1999), was a University of Chicago paleontologist. Sepkoski studied the fossil record and the diversity of life on Earth. Sepkoski and David Raup contributed to the knowledge of extinction events. They suggested that the extinction of dinosaurs 65 mya was part of a cycle of mass extinctions that may have occurred every 26 million years.
Read more about Jack Sepkoski: Life and Work, Awards, Selected Publications, Further Reading
Famous quotes containing the word jack:
“This is the rat
That ate the malt
That lay in the house that Jack built.”
—Mother Goose (fl. 17th–18th century. The House That Jack Built (l. 4–6)