All data was compiled from original sources namely, site forms and maps submitted yearly by researchers.
The dataset consists of sites registered from the inception of the CMC Sites Database in 1971 up to September 2007 and relates to sites observed by explorers and/or field researchers from the 19th century up to the present day.
Registration of sites located in Yukon, Northwest Territories, Nunavut and Prince Edward Island is on-going. An average of seven hundred (700) new sites and several hundred revisits to previously registered sites are recorded each year.[Data Dictionary]