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According to exwitch.com.au
Alan Dash, a surveyor with the Gosford City Council between 1968 and 1993, first noticed the carvings about 1975. Thoroughly familiar with the area, he revisited the site several times over the next 5 years, each time observing that more and more carvings appeared on the rock face. He considered the engravings the work of an irresponsible vandal.
Neil Martin, Ranger with the National Parks and Wildlife Service (NPWS) at Gosford, himself found the man responsible. "In 1984 I was in the area helping to put out a fire", he told me. "As I came around the base of the hill, I could hear a noise like someone chipping stone. I walked over to the cleft and found an old Yugoslavian man, chipping the stone with a Sidchrome cold chisel. Because this was national park property, I confiscated the chisel and the man left. Because he was mentally handicapped, we took no further action, but I later gave the chisel to the local historical society. We never saw the old man again."
In the other post the ranger said "but I later gave the chisel to the local historical society". I'm not sure if the local history society is a museum or a non profit org, but maybe they still have or surely remember the chisel.
6. So, how old are the engravings?
Taking all of the evidence together, they were carved over a period from the 1960s to 1984. They are at most about 50 years old.
The lines of evidence that support the date of 50 years maximum are:
Condition of the engravings – The edges of the engravings are sharp and made with hard chisels leaving clean V shaped cuts. Close examination shows no sign of any re-cutting.
Lack of erosion – There is no sign of the erosion that would have been present over more than 3,000 years or even 450. Even if the erosion rate of 13-17 mm per century were reduced somehow by 99%, the 3.9-5.1 mm of weathering would be clearly visible on the edges of every cut. Any more than 10 mm of erosion and many of the figures would be rendered illegible.
Lichen growth – There are two main types of lichen growing on the sides of the cleft – a green circular lichen – Xanthoparmelia – and a lighter one with black ‘peppery’ spots – Buellia. Symbols were cut through the Xanthoparmelia lichen and they have not in any instance had time to re-colonise the cuts. Comparison with examples on different surfaces and moisture conditions shows highly variable growth for this lichen. The thallus [central body] grows about 5 mm in radius every 30 years, or 15 mm per century. The Buellia lichen grows about twice as fast as Xanthoparmelia. Xanthoparmelia has not re-colonised any of the engraving cuts where it has been severed but Buellia has.
The oldest lichen in the cleft is only several centuries old at most and is not found in the engravings. It is likely to reflect the relative age of the crack, suggesting it only formed a few hundred years ago. The precarious position of the overlying boulder suggests its separation and eventual collapse is still a work in progress.
Comparison with other sandstone construction of similar or greater age – We can easily compare dated sandstone headstones or buildings throughout Sydney to see how it fares over 50 years or a century. We can also look at Aboriginal engravings, including a number within a short distance at the public site of Bulgandry, which are a minimum of two centuries old. We can examine the convict-built Great North Road from the 1830s. In comparison with the Kariong engravings, on exactly the same sort of stone, any stonework over a century old is much more deteriorated. The Kariong engravings are clearly younger than that.
Lack of erosion – There is no sign of the erosion that would have been present over more than 3,000 years or even 450
1. look at the hieroglyphs at that site and at those found in Egypt. There is no comparison. The ones found in Egypt were done VERY meticulously and with precision, even rough hieroglyphs, these are VERY sloppily done.