Carboniferous clay deposits from Jenolan Caves, New South Wales: implications for timing of speleogenesis and regional geology

  title={Carboniferous clay deposits from Jenolan Caves, New South Wales: implications for timing of speleogenesis and regional geology},
  author={R. Armstrong L. Osborne and Horst Zwingmann and R. E. Pogson and David M Colchester},
  journal={Australian Journal of Earth Sciences},
  pages={377 - 405}
K – Ar dating of illite-bearing clays from eight locations in Jenolan Caves yielded ages from 394 Ma (Early Devonian) to 258 Ma (Late Permian) (18 dates of individual size fractions). There were two distinct clusters among the dates. Seven dates ranged from 342 to 335 Ma (Carboniferous, Visean). Three dates ranged from 394 to 389 Ma (Early Devonian). Fission track dating of 11 zircons from one sample yielded pooled ages of 345.9 Ma (nine grains) and 207.2 Ma (two grains). XRD peak width… 

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