is really a rare volcanic formation located near Mount Macedon in Victoria, Australia. It is said to be the best example of a volcanic plug or mamelon in the world. Since its formation, the mamelon has been exposed to considerable weathering and erosion, resulting in a conglomeration of unusual rock formations that can now be seen on the site. You can hike up the rocks to some great viewpoints, where the rocks just seem to hang on top of each other.
Supposedly there is a mysterious story now made into a movie about a girls’ school who went on a picnic to Hanging Rock in 1900. Several girls plus a teacher disappeared from there, never to be heard from again. Apparently there are holes between the rocks that have no bottom and no traces of the disappeared people were ever found, even after intensive searches! Since then we have enjoyed watching the Australian movie of that story, aptly entitled "Picnic at Hanging Rock". In spite of the drama from the past, we had a great and safe hike and enjoyed a deliciously warm coffee respite at the cozy restaurant there.
The next morning was bright and sunny and we awoke to discover the front part of an actual tram sitting in the King's back yard. We soon learned that Greg is a tram aficionado, collecting and making replica trams in his garage.
The ‘organ pipes’ are really a set of basalt columns as straight and regular as organ pipes formed about a million years ago by one of the world's largest lava flows. The massive lava flow, about 70 metres thick, spread over the plains from nearby volcanic hills. A surface crust formed and the lava beneath cooled very slowly and contracted. Vertical surface cracks developed, and as the lava continued to harden, the cracks lengthened until the basaltic mass was divided into columns. Over the next million years, the Jacksons Creek gouged out a deep gorge in the bare surrounding Keilor plains. This deep valley cut through the thick basalt layer to expose the formation known as 'the organ pipes'.
There were other rock phenomena to be seen as we hiked through the park, like the Rosette Rock which is a radial array of basalt columns like the spokes of a wheel, and the Tessellated Pavement, the tops of basalt columns. It was a beautiful site,
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