1858
Churches: the Westminster Presbyterian Church was formed on the west side of Beloit; a cemetery association was formed and a one-acre cemetery located; a church parsonage was built (1858–59) at a cost of $670; pastors took office or ended service (Rev. Robert Blackburn; Rev. Mr. [Frink's successor]; D. O. Jones and Daniel Stansberry; L. G. [successor of M. Pascoe]; B. Hatch from 1858; Rev. Galusha Anderson's term ended 1858; Rev. J. Goodspeed began 1858).
The evidence
“D., 1863 to 1865. Then occurred the union of the "Westminster Presbyterian Church (formed on the west side in 1858) with this First church under Dr. AVilliam Alexander, 1865 to 1869.”
1908-brown-rock-county/13-beloit-churches.md, Vol. 1, PDF p. 296 / book p. 271
Brown, William Fiske, editor. Rock County, Wisconsin: A New History of Its Cities, Villages, Towns, Citizens and Varied Interests, from the Earliest Times, Up to Date. Chicago: C. F. Cooper & Co., 1908. 2 vols. archive.org/details/rockcountywiscon01brow, archive.org/details/rockcountywiscon02brow.
Grade A: Found on a page of one of our sources
“C. Mason; 1858, Rev. Robert Blackburn; 1859, Rev.”
1879-history-of-rock-county/16-rock-county-ch10-villages.md, PDF p. 683
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