A couple of young Casuarinas (?Allocasuarinas?), with deeply furrowed tan bark, which even looks a bit corky (photos 2 & 3). Photo 1 shows the natural fall of the top of the youngest (or thinnest), and photo 4 (hopefully) gives some impression of their most mature leaves. (I think the big tree trunk behind them belongs to an angophora), and there is a young Red Ash to the LHS of them.