No order of the Commission creating a unit and prescribing the plan of unitization applicable thereto shall become effective unless and until the plan of unitization has been signed, or in writing ratified or approved by lessees of record of not less than sixty-three percent (63%) of the unit area affected thereby and by owners of record of not less than sixty-three percent (63%) of the normal one-eighth ( ⅛ ) royalty interest in and to the unit area, and the Commission has made a finding either in the order creating the unit or in a supplemental order that the plan of unitization has been so signed, ratified or approved by lessees and royalty owners owning the required percentage interest in and to the unit area. Where the plan of unitization has not been so signed, ratified or approved by lessees and royalty owners owning the required percentage interest in and to the unit area at the time the order creating the unit is made, the Commission shall, upon petition and notice, hold such additional and supplemental hearings as may be requested or required to determine if and when the plan of unitization has been so signed, ratified or approved by lessees and royalty owners owning the required percentage interest in and to the unit area and shall, in respect to such hearings, make and enter a finding of its determination in such regard. In the event lessees and royalty owners, or either, owning the required percentage interest in and to the unit area have not so signed, ratified or approved the plan of unitization within a period of six (6) months from and after the date on which the order creating the unit is made, the order creating the unit shall cease to be of further force and effect and shall be revoked by the Commission.