Sedimentology of the Burra Group in the East Rooks area, northeastern Willouran Ranges, South Australia

Abstract

Detailed stratigraphic mapping and facies analysis in the East Rooks area has revealed 7 stratigraphic units representing distinct depositional events. These 7 units, designated ER1 (East Rooks) to ER7, reflect broad environmental changes indicated by lithology, sedimentary structures and energy regimes. Early environments include locally developed distal alluvial fans and fluvial braid plains, marginal marine sabkhas and wave influenced fan deltas. The subsequent widespread phase of deposition occurred in marine to marginal marine environments. This study has shown that Burra Group sedimentation was influenced by a palaeohigh to the north, thought to be an area of uplifted Callanna Beds.