Gen. George Rogers Clark (1752 - 1818) b. Virginia George Rogers Clark died February 13, 1818 in Louisville, Kentucky, at the home of his sister and brother-in-law, known as "Locust Grove". Corresponded with Thomas Jefferson on Big Bone Lick, which he may have visited. Thomas Jefferson made the following request in a letter:
"Any observations of your own on the subject of the big bones or their history, or on any thing else in the Western country, will come acceptably to me, because I know you see the works of nature in the great, and not merely in detail. Descriptions of animals, vegetables, minerals, or other curious things, notes as to the Indians, information of the country between the Missisipi (sic) and waters of the South set &c. will strike your mind as worthy being communicated. I wish you had more time to pay attention to them."

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References:

Samuel W. Thomas, and Eugene H. Conner, "George Rogers Clark: Natural Scientist and Historian," Filson Club Historical Quarterly 41 (1967): 216.