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Identification of the genus is not certain, but more than likely it was the forked-frond seed-fern The fossil was probably the wood from the stem of a frond.
Several quarries still operate in the Gosford area just north of Sydney, and one near Bundanoon to the south-west.
Rather than consisting of just one sandstone bed encompassing its total thickness, the Hawkesbury Sandstone is made up of three principal rock types—sheet sandstone, massive sandstone and relatively thin mudstone.
For example, thin repetitive bands sloping at around 20° within the flat-lying sandstone beds (technically known as cross-beds), sometimes up to 6 m (20 ft) high, would have been produced by huge sandwaves (like sand dunes) swept along by raging water. However, spectacular fossil graveyards have been found in several lenses (lenticular bodies of only limited extent) of mudstone.
Buried catastrophically in sand by the raging Flood waters only about 4,500 years ago, this fossil wood contains less than the expected amount of radiocarbon, because of a stronger magnetic field back then shielding the Earth from incoming cosmic rays.
The Flood also buried a lot of carbon, so that the laboratory’s calculated Where are you while reading this article? The internet, and this site in particular, can be a powerful tool for reaching those who would never go to church.