Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.ABSTRACT 17 Definition of early Cambrian chronostratigraphic boundaries is problematic with 18 many subdivisions still awaiting ratification. Integrated multi-proxy data from well-resolved 19 regional-scale schemes are ultimately the key to resolving broader issues of global correlation 20 within the Cambrian. In Australia, early Cambrian biostratigraphy has been based 21 predominantly on trilobites. Phosphatic shelly fauna have great potential as biostratigraphic 22 131 etheridgei Zone and the Dailyatia odyssei Zone. These zones can be correlated intra-basinally 132 across a broad suite of synchronous carbonate-dominated facies represented by the 133 Wilkawillina, Wirrapowie and Ajax limestones as well as inter-basinally with the broadly 134 synchronous fossiliferous packages in the Stansbury and Officer Basins in South Australia, 135 and the Amadeus Basin in the Northern Territory. They also have faunal ties with early 136

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The most successful chronostratigraphic correlation methods enlist multiple proxies such as biostratigraphy and chemostratigraphy to constrain the timing of globally important bio-and geo-events. Here we present the first regional, high-resolution shelly fossil biostratigraphy integrated with  13 C chemostratigraphy (and corresponding  18 O data) from the lower Cambrian of South Australia. The global ZHUCE, SHICE, positive excursions II and III and the CARE are captured in lower Cambrian successions from the Arrowie and Stansbury basins. The South Australian shelly fossil biostratigraphy has a consistent relationship with the δ 13 C results, bolstering interpretation, identification and correlation of the excursions. Positive excursion II straddles the boundary between the Kulparina rostrata and Micrina etheridgei zones, and the CARE straddles the boundary between the M. etheridgei and Dailyatia odyssei zones, peaking in the lower parts of the latter zone. New 3 CA-TIMS zircon dates from the upper Hawker Group and Billy Creek Formation provide calibration points for the upper D. odyssei Zone and corresponding chemostratigraphic curve, embedding the lower Cambrian successions from South Australia into a global chronostratigraphic context. This multi-proxy investigation demonstrates the power of integrated multi-proxy methods for global correlation of regional biostratigraphic schemes, facilitating robust global correlation of lower Cambrian successions from South Australia with coeval terranes on other Cambrian palaeocontinents, including South and North China, Siberia, Laurentia, Avalonia and West Gondwana.