John Jeremiah Bigsby (14 August 1792 – 10 February 1881), was an English physician who became known for his work on geology, an interest developed while on military service in Lower and Upper Canada, 1818-1826.
In 1868, he published his most important scientific work, Thesaurus Siluricus, being a list of all the fossils which occur in the Silurian formation across the world.
The following year, he was appointed medical officer to a German Rifle Regiment in the English service and posted with them to British North America.
[3] He was stationed at Quebec City but was sent to Hawkesbury in Upper Canada to treat a typhus epidemic among Irish immigrants.
During the last twenty years of his long life he was continually at work preparing, after the most painstaking research, tabulated lists of the fossils of the Palaeozoic rocks.