From what I can see there are no banksia sp on the Mt Mugga field guide, but these seem to have been planted so I'm wondering if anyone would know what these might be. I've suggested Banksia marginata for now, would anyone happen to know if there has been any previous Banksia plantings on Mt mugga.
Plantings would be 2004-05. See my comments on https://canberra.naturemapr.org/sightings/4381513. Invasive plants such as Robinia and Gleditsia would date from this time but Ligustrum and Pyracantha would have been around earlier.