J. A. COOPER, R. J. F. JENKINS, W. COMPSTON, I. S. WILLIAMS; Ion-probe zircon dating of a mid-Early Cambrian tuff in South Australia. Journal of the Geological Society ; 149 (2): 185–192. doi: https://doi.org/10.1144/gsjgs.149.2.0185
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Ion microprobe U-Pb dating of zircons extracted from a narrow tuff band in the Lower Cambrian Heatherdale Shale of South Australia produced an age of 526 ± 4 Ma (95% confidence limits). Local and regional trilobite and archaeocyathan evidence indicates that the tuff ìs latest Atdabanian or Botomian. The tuff shortly predates the onset of the Delamerian Orogeny.