Starting from the Macquarie Park train station you wander down Lane Cove Rd and over De Burghs Bridge to join the main spine of the Great North Walk in the Lane Cove Valley. Here the walk heads under De Burghs bridge then explores the dry grass tree and eucalypt forest along the side of the ridge. The track soon leads you down into the ferny and moist valley beside Lane Cove River. Near the top of the valley you walk up some stone steps built during the depression to find some rock engravings with 1930’s style political satire Conscript Pass. The side trip provides access to the scout campsite where the main walk continues leads up through the streets to find Thornleigh train station.