Major progress has recently been made regarding the biostratigraphy, lithostratigraphy and isotope chemostratigraphy of the lower Cambrian successions in South Australia, in particular of the Arrowie Basin, which has facilitated robust global stratigraphic correlations. However, lack of faunal and sedimentological data from the lower Cambrian Normanville Group in the eastern Stansbury Basin, South Australia – particularly the transition from the Fork Tree Limestone to the Heatherdale Shale – has prevented resolution of the age range, lithofacies, depositional environments and regional correlation of this succession. Here we present detailed sedimentologic, biostratigraphic and chemostratigraphic data through this transition in the eastern Stansbury Basin. Three lithofacies are identified that indicate a deepening depositional environment ranging from inner-mid-shelf (Lithofacies A and B) to outer shelf (Lithofacies C). New δ13C chemostratigraphic data capture global positive excursion III within the lower Heatherdale Shale. Recovered bradoriid Sinskolutella cuspidata supports an upper Stage 2 (Micrina etheridgei Zone). The combined geochemistry and palaeontology data reveal that the lower Heatherdale Shale is older than previously appreciated. This integrated study improves regional chronostratigraphic resolution and interbasinal correlation, and better constrains the depositional setting of this important lower Cambrian package from the eastern Stansbury Basin, South Australia.

中文翻译：

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南澳大利亚斯坦斯伯里盆地下希瑟代尔页岩（寒武纪，第 2-3 阶段）的沉积学和综合年代地层学

最近在南澳大利亚下寒武统地层，特别是阿罗伊盆地的生物地层学、岩石地层学和同位素化学地层学方面取得了重大进展，这促进了强大的全球地层相关性。然而，缺乏来自南澳大利亚斯坦斯伯里盆地东部下寒武统诺曼维尔群的动物和沉积学数据——特别是从叉树石灰岩到希瑟代尔页岩的过渡——阻碍了年龄范围、岩相、沉积环境和区域的解析。这个继承的相关性。在这里，我们通过斯坦斯伯里盆地东部的这一过渡提供详细的沉积学、生物地层学和化学地层学数据。确定了三个岩相，表明从内陆架（岩相 A 和 B）到外陆架（岩相 C）的沉积环境不断加深。新δ13C 化学地层数据捕获下希瑟代尔页岩内的全球正偏移 III。恢复的bradoriid尖尾鱼支持上级 2 (微藻区）。结合地球化学和古生物学数据表明，下希瑟代尔页岩比以前认为的要古老。这项综合研究提高了区域年代地层分辨率和盆地间相关性，并更好地限制了南澳大利亚斯坦斯伯里盆地东部这一重要的下寒武统包裹的沉积环境。