Carrying out of activities listed in the Schedule (quarrying and timber harvesting) in specified forest areas is suspended. No person or vehicle shall enter such areas for purposes of carrying out suspended activities. The suspension of activities remains in force for a trail period of ninety days, after which the Minister, on the basis of research carried out, may extend the measure for such period as a deems fit. Exemption of the suspension shall be granted on the basis of a sustainable fellin