Ole Wollum/Vollum - Bore Thoreson

Looking for origins of Ole Wollum & wife Lena. Ole's tombstone says he was born 8 Dec 1859 (family says in Sør Trøndelag). Emigrated about 1880 (according to 1900 & 1910 census Rock Creek, Dunn Co. WI) There is an Ole Vollum listed as sawmill worker on 1880 census Menomonie, Dunn Co WI. Ole died 11 Sep 1919. Ole & wife Lena are buried Rock Creek Cem, Dunn Co. WI. In 1893 in Dunn Co WI, Ole married Lena Borresdatter Thoreson (1865-1910). Lena's parents Bore Thoresen (1829-1906) & Magrete (1841-1912) came from Oppland about 1868 with 3 or 4 children. Lived in Peru twp Dunn Co WI and buried in Peru cemetery.