A meeting was held at the house of Ansel Dickinson on Rock Prairie to organize a Congregational church; one passage dates it August 13, another August 16.

The evidence

• “First Congregational Church. — On August 13, 1838, a meeting was held at the house of Mr. Ansel Dickinson, on Rock Prairie, near Mount Zion, wherein it was determined to organize a church of the above denomination.”

  1879-history-of-rock-county/16-rock-county-ch10-villages.md, PDF p. 680

  Butterfield, C. W., et al. The History of Rock County, Wisconsin: its early settlement, growth, development, resources, etc. Chicago: Western Historical Company, 1879. Cornell University Library via the Internet Archive, archive.org/details/cu31924028871585.

  Grade A: Found on a page of one of our sources