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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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