| Birth | Serepta Coleman was born on 2 April 1828 at Beverly Township, Gore District, Upper Canada. |
| Marriage | She married Thomas Postlethwaite on 22 July 1848 at Poplar Grove, Boone Co., Illinois.
Familysearch.org provides us with a brief transcription dating the marriage of Serepta and Thomas to 22 July, 1848, in Boone County. It sources GS film number 848648. |
| Death | She died on 3 October 1914 at age 86. |
| Burial | She was buried at Poplar Grove Cemetery. |
| Note | The Republican Northwestern of Friday, October 23, 1914, carries an obituary for Serepta. It dates her birth to April 2, 1828, in Beverly, Canada. It tells that she and Thomas had ten children, though at the time of her death seven were predeceased. The obituary mentions that her sister Phoebe was still living. |