In this Division--
"unauthorised material" means any material (for example, timber, building
materials or equipment) brought on to Crown land without lawful authority,
except structures or other fixtures.
"unauthorised structure" on Crown land means--
(a) a structure that, at the time of its erection, was not authorised to be erected by or under the provisions of this Act or another Act (except Part 11 or 12A of the Local Government Act 1919 , Part 1 of Chapter 7 of the Local Government Act 1993 or the Environmental Planning and Assessment Act 1979 ), or
(b) a structure that--(i) was authorised to be erected or used by or under the provisions of this Act or another Act (except Part 11 or 12A of the Local Government Act 1919 , Part 1 of Chapter 7 of the Local Government Act 1993 or the Environmental Planning and Assessment Act 1979 ), and(ii) is or was required to be removed by or under those provisions at or within a specified time, and(iii) has not been removed as required.