1822 – Born on the 22nd of December in Windsor, Conn.
1846 – He graduated from Western Reserve University.
1851 – He established his medical practice in Cleveland.
1855 – He joined an exploring expedition under Lieutenant Williamson.
1857 – He acted as geologist to an expedition headed by Lieutenant Ives.
– He was called to a professorship at Columbian University.
1866 – He was offered the Chair of geology and paleontology in the School of Mines, Columbia College.
1888 – He assisted in the organization of the Geological Society of America at Cleveland.
– He served on the commission to organize an international geological congress.
1892 – He died on the 7th of December in New Haven, Connecticut.