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In 1601, Oñate unsuccessfully tried to find the legendary silver of Quivira (thought to be in what is now central Kansas). While he was gone, most of his settlers returned to Mexico City. In 1604, he explored the area west toward the Colorado River and south to the Gulf of California. In 1607, Spain removed him from office (Don Pedro de Peralta was appointed to be the new governor); Oñate was later tried and found guilty of cruelty, immorality, mismanagement, dereliction of duties, and false reporting. He was exiled from the colony.

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Oxley was born in England, and sailed to Australia in 1802 while in the British Navy. For years, he surveyed the coast of Australia, then in 1806 he commanded a ship to Van Diemen's Land (later called Tasmania).

After returning to England and being promoted to lieutenant, Oxley sailed to Australia (1808). He was granted 600 acres (240 hectares) of land in Sydney and was appointed surveyor-general of New South Wales. He continued his surveys of Australia, including: the Lachlan River region (with George Evans, 1817), the Macquarie River (1818), Jervis Bay and Port Macquarie (1819), Moreton Bay and 50 miles (80 km) up the Brisbane River (1823).