Abstract Sediments comprising the Radium Ridge Breccia, a stratigraphic unit recognised within the Mesoproterozoic Mount Painter Inlier, are now re-interpreted as Lower Cretaceous (previously interpreted to be Paleozoic) periglacial deposits with associated glacial and pro-glacial facies that extend into adjacent Eromanga Basin sediments. The interpretation is based on distinctive periglacial, glacial and pro-glacial facies, clast lithology, geochronology and consistent stratigraphic position above the Mesoproterozoic basement. Facies recognised are kame deposits, tillites, talus, mass-flow and solifluction lobes. The depositional model presented herein is that the Radium Ridge Breccia unit formed in a glacial/periglacial environment in moderately elevated highlands, in a proximal, mainly terrestrial setting adjacent to the Eromanga Basin, during the Early Cretaceous. LA-ICPMS U–Pb geochronology of the distinctive Sprigg Tillite Member, a lodgement tillite within the Radium Ridge Breccia unit, yielded the youngest zircon ages ca 240–220 Ma and monazite ages ca 365 Ma that are consistent with the interpretation of this subunit, and hence the Radium Ridge Breccia formed during the Early Cretaceous. The Sprigg Tillite Member is correlated with the early Aptian Sheehan Cretaceous glacial event.

中文翻译：

---

南澳大利亚弗林德斯山脉北部的潘特因利尔山内的早白垩世冰川环境和古地表演化

摘要 包含 Radium Ridge Breccia 的沉积物，是在中元古代 Mount Painter Inlier 内被确认的地层单元，现在被重新解释为下白垩统（以前被解释为古生代）冰缘沉积物以及相关的冰川和前冰川相延伸到相邻的 Eromanga 盆地沉积物。该解释基于独特的冰缘、冰川和前冰川相、碎屑岩性、地质年代学和中元古代基底上方一致的地层位置。识别出的相是kame 沉积物、微耕岩、距骨、质量流和溶流裂片。此处介绍的沉积模型是镭岭角砾岩单元在中等升高的高地的冰川/冰缘环境中形成，在邻近 Eromanga 盆地的近端，主要是陆地环境中，早白垩世期间。独特的 Sprigg Tillite 成员的 LA-ICPMS U-Pb 年代学是镭角角砾岩单元内的一种沉积岩，产生了最年轻的锆石年龄约 240-220 Ma 和独居石年龄约 365 Ma，与该亚基的解释一致，因此镭岭角砾岩形成于早白垩世。Sprigg Tillite 成员与早期 Aptian Sheehan 白垩纪冰川事件相关。