Cherrybrook to Dural crossing?

Anybody know how to cross from the hills of Cherrybrook down through the gully and up to the plateau Dural is on (Quarry Road) without having to go down to New Line Road? Hoping to link it up for a large loop that includes Quarry Road. Staying off Great North Walk.

http://maps.google.com/maps?f=q&hl=en&q=Australi...

See those houses on that unsealed fork. They are at the bottom on the Dural side of the creek I think. If I can get to that road from Cherrybrook (through the bush) that will do it.

http://maps.google.com/maps?f=q&hl=en&q=Australi...