Fonds consists of biographical notes, clippings, articles, early educational records, research notes, draft manuscripts, field notebooks, reports, publications, correspondence, lecture and course notes, maps, photographic prints, and slides pertaining to M.Y. Williams' professional and personal activities.

The fonds consists primarily of material accumulated during a survey of Hong Kong undertaken by the Department of Geology between 1923 and 1933. It is composed of notes, maps and reports generated by Brock and his associates. There are also some papers from the files of the Department of Geology. The papers have been roughly sorted according to form. Also included are several non-UBC publications initially kept in the Brock family library.