North West Solitary Island is an island found off the New South Wales coast and inside the continental shelf. It is located 30 km north-east of Coffs Harbour and about 18 km south of Wooli.
The island is part of the Solitary Islands Marine Park established 2 January 1998 and managed by the New South Wales Maritime Parks Authority.[1]
Rocks on North West Solitary Island consist of repeating beds of sillicaceous argillite, mudstone and sandstone. The argillite probably formed from volcanic ash falls. The beds are 5 to 10 cm thick. The strike of the beds is between 0° and 20° with overturned beds dipping to the east. The mudstone shows cleavage at an angle steeper than the bedding planes by 20°. Tectonically it is part of the Coffs Harbour Block which in turn is part of the New England Orogen.[2]