15. The municipality or any part of it may be constituted a town municipality or a country municipality, according to the procedure provided in the Cities and Towns Act (chapter C-19) or the Municipal Code (chapter C-27.1), as the case may be. From the time of such constitution, the municipality or the part concerned shall cease to be governed by this act.
The orders, acts, resolutions, by-laws or other municipal proceedings in force in the municipality when this act ceases to apply to it shall remain in force until amended, replaced or set aside by the council of the town or country municipality.