1. Geological Survey of New South Wales, New South Wales Department of Planning and Environment, 516 High Street, Maitland, New South Wales 2320, Australia
2. PALM Laboratory, Centre for Frontier Geoscience, Newcastle Institute for Energy and Resources, University of Newcastle, Callaghan, New South Wales 2308, Australia
3. MagneticEarth, 617 Hinterland Way, Newrybar, New South Wales 2479, Australia