Flow pattern within a Permian submarine slump recorded by oblique folds and deformed fossils, Ulladulla, south-eastern Australia

摘要: The flow pattern within a slump in Permian marine rocks of the southern Sydney Basin, Australia, is recorded by folds and deformed fossils. Abundant brachiopod bryzoan fossils slumped are relatively undeformed, but fossil crinoid stems have been relative rotation individual ossicles. Measurement strain indicates that deformation crinoids consistent with flexural folding slump. Previous models assume curved fold axes remain parallel to enveloping bedding surface sheet. Detailed measurements orientation this study found be oblique bedding, which interpreted as result plunging downward towards flanks or lobes. In present model, not generally strike axial surface, can explain differences between orientations surfaces when these used directional indicators movement.