On a recent Saturday that dawned clear and warm, more than 50 people were treated to a fine, practical lesson in how to read the landscape. A frequent and welcome visitor to these parts, Dr. Neville Rosengren, led a day-tour that investigated the geology and landscape of the Upper Goulburn Catchment and the southern rim of the Stratbogie Ranges, the hard rock of the so-called metamorphic aureole.
Following a short refresher course in landscape history and change (geomorphology) presented in the new club rooms of the Yea Tennis Club (along with morning tea), Neville led us to our first stop – the Ghin Ghin floodplain. There, we saw ancient river channels exposed in a road cutting, that today sit 15 meters above the current level of the Goulburn River.
By this stage it was already lunch time, so we settled in behind the Highlands Hall for a most delicious, gourmet lunch. This also gave us time to bring out the 3D model of the Goulburn Broken Catchment for a broader overview of the Goulburn Broken Catchment.
Stop 2 was at the top of the Ghin Ghin Cutting, where the contact zone between the Strathbogie Granite and the harder rock of the metamorphic aureole is visible. This proved to be a fascinating site to interpret and we spent time examining the nature of the contact.
Our final Stop was atop Mt Broughton, a cleared, grassy hill-top right on the aureole, looking across the granite landscape to the north and the Goulburn River Floodplain (Yea, Ghin Ghin) to the south. Indeed, the day was clear enough to see, not only the volcanic peak of Mt Torbreck to the SE, but we could even see right over the ‘Divide’, to the peaks around Healesville, 60 km to the south.
The fine weather ensured we all had a pleasant day and Neville’s clear and entertaining descriptions of the landscape around us made doubly sure that we all ended the day considerably wiser about this fascinating corner of the Goulburn Broken Catchment.
You can also read about the day on the SR CMN website.
The 2012 Geology field day was made possible by the Strathbogie Ranges Conservation Management Network through funding from the Australian Government’s Caring for our Country initiative, support from the Goulburn Broken Catchment Management Authority and collaboration with the Upper Goulburn Landcare Network.