Bacon rasher?

It is actually called a ‘bacon rasher’. Over millions of years, water has seeped through the layers of limestone in the Kelly Hills region of Kangaroo Island, and into the caves below. At various points in time, this water had to filter through different layers of red soil, organic matter and minerals, leaching different chemicals out each time. The dark browny orange layers contain tannins from decaying leaf litter on the forest floor above. The darkest layer contains soot (carbon) from when the forest above was razed by a fire. The clear layers are when the water dripped into the cave ‘neat’; no colour means it seeped in from a stream or other water body. The shape occurs because the stalagtite/mite forms in a sheltered area, with air currents only coming from one direction, shaping the rasher as they flow.


One thought on “Bacon rasher?

  1. These trees were then covered by silt and volcanic ash and this cut off the oxygen and slowed decay. Gradually the logs were covered by silica – from the ground waters – and this seeped through the wood, enclosing the tissues with silica. The silica crystallized into mineral quartz and the logs were preserved as petrified wood. Wind an water gradually – over millions of years – wore away the layers of sediments leaving the petrified logs exposed on the surface. And what a wonderful sight is is today.

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