01 Feb The Pinnacles
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The Pinnacles are limestone structure formations within Nambung National Park located near the town of Cervantes, Western Australia. These structures can go up to the varying heights ranging from as short as a few centimeters and as tall as up to 5 meters.
The limestone of the Pinnacles consists of raw materials that came from seashells in an earlier era that was rich in marine life. Over time, these shells were broken down into lime-rich sands that were blown inland to form high mobile dunes. At the same time, vegetation that became established on the surface aided this process. Plant roots stabilized the surface and encouraged a more acidic layer of soil and humus containing decayed plant and animal matter to develop over the remaining sand.
Three major theories have been proposed for the formation of Pinnacles. They are –
The first theory states that they were formed as dissolution remnants of Tamala Limestone. The focused solution initially formed small solutional depressions, mainly solution pipes, which were progressively enlarged over time, resulting in the pinnacle topography.
A second theory, on the other hand, states that they were formed through the preservation of tree casts buried in coastal aeolianites, where roots became groundwater conduits, resulting in the precipitation of indurated calcrete. Subsequent wind erosion of the aeolianite then exposed the calcrete pillars. A third theory suggests that plants played an active role in the creation of the Pinnacles, based on the mechanism that formed smaller “root casts” in other parts of the world.
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- Modern and advanced teaching techniques
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