The fonds testifies to the activities carried out by the Holy Cross Mission of Wiikwemkoong since its transfer to the Jesuits in 1844 and until 2004, and provides information on the history of Manitoulin Island, Wiikwemkoong and other communities of Northern Ontario. It provides information on the activities of the parishes Jesuit missionaries served via administrative and financial records, as well as sacramental registers that compiled data on the members and families of the communities. Thus, in addition to documenting the activities of the Holy Cross parish and missionaries, the fonds contains records concerning the parishes of Gore Bay, Little Current, Killarney, Batchewana, M’chigeeng, Sheshegwaning, Spanish River and Lake Huron North Shore, among others. It also contains records testifying to the Jesuits’ interest and implication in schools in Batchewana, Kaboni, Killarney, Sheguiandah, Spanish, and Wiikwemkoong.

The fonds contains diaries and notes taken by Jesuit priests concerning the activities of the missions and certain events. It also contains correspondence, parish communications, work documents and history notes, Status Animarum, Historia Domus, manuscripts, two publications, a prospectus, programs, architectural drawings and maps, as weel as photographs that document the different mission points, landscapes, church buildings, Catholic celebrations, events, and parish members and families.

The series provides information about the activities held in the parishes of the Holy Cross of Wiikwemkoong, Gore Bay, M'chigeeng (West Bay/Excelsior), Sheguiandah, Sheshegwaning, Spanish River and Lake Huron North Shore, mainly between 1952 and 2004. It documents the catholic celebrations and special events, as well as the communities’ daily life and members.

The series is divided into three files: Parish Communications; Parish Anniversaries and Catholic Celebrations; Social Gatherings and Community Members. It contains a significant number of bulletins addressed to the parishioners of Manitoulin Island, Wiikwemkoong and other regions of Northern Ontario, as well as photographs, programs, speeches and communications in connection with Parish Anniversaries, catholic celebrations and other events.