Possible Late Mesoproterozoic or earliest Neoproterozoic glacial deposits, Beetaloo Sub-basin, Northern Territory

Abstract

In the Beetaloo Sub-basin, the Kyalla Formation is unconformably overlain by a late Mesoproterozoic to early Neoproterozoic sandstone to mudstone succession comprising three formations/units: the lower Jamison sandstone, the upper Jamison sandstone, and the Hayfield mudstone (Munson, 2016; pers. comm. 2022). Gorter and Grey (2013) subdivided the Jamison sandstone into two mappable units separated by an unconformity. The Jamison sandstone and overlying Hayfield mudstone represent a marked change in provenance and were deposited after the Musgrave Orogeny in a basin dominated by silciclastic sedimentation that may have formed a shallow, long-wavelength foreland basin to areas uplifted during the Musgrave Orogeny.