What day of the week was September 18, 1870?

The day of the week September 18th, 1870 fell on was a Sunday.

Clark Wissler the American anthropologist (d. 1947) was born on 18 September in 1870.

Old Faithful Geyser is observed and named by Henry D. Washburn during the Washburn-Langford- Doane Expedition to Yellowstone.