The thing that is very obvious about Casuarina glauca is the extremelt long branchlets (to 38 cm long). Cones can be used for identification, but are a minefield, even in the hand. The number of teeth between segments of the branchlets can help with ID. However, in this photo, it looks as if the branchlets are too old to still have teeth. A local moderator might know the site and what is there. https://keys.lucidcentral.org/keys/v3/plants_se_nsw/key/plants_se_nsw/Media/Html/entities/casuarina_glauca.htm
Branchlets too thick for A. littoralis. The who,e of the Bawley Point essexite soils is covered in C. glauca, well inland. Due probably because of poor drainage qualities of this type of soil.