September 6: edit
- 1802 - Alcide d'Orbigny was born in Couëron, France.
- 1807 - William Clark and his brother George Rogers Clark arrived at Big Bone Lick, Kentucky, USA to obtain fossils. William Clark reported that so many people had taken bones from the site that even after two weeks of effort it was difficult to find quality specimens. Nevertheless, the Clarks' expedition uncovered about 300 bones they felt of sufficient caliber to send to then-US president Thomas Jefferson.
- 1921 - Henry Woodward died at age 88.
- 1941 - Walter W. Granger died of heart failure in Lusk, Wyoming, USA at age 68.