Quote:
Originally Posted by alocky
Definitely not a vertebrate fossil - it looks like either a bit of syngentic karstification (localised mineralisation of the near surface soil due to CaCO3 rich groundwater movement), or as the other poster has already said, heavily weathered limestone. Would also add - definitely not volcanic either, so not pumice.
Qualifications - undergrad in geology from QUT, so I know the rocks of the region, and postgrad in geophysics from UQ, Uni of Utah and UWA. But it is still pretty hard to tell from the pictures exactly what it is. Nothing beats knocking off a corner to see a fresh bit, and giving it a lick.
cheers,
Andrew.
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Thanks Andrew and @Heuy
for your helpful and informed replies.Might try and do a test with vinegar,if I get time