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Kindly supported by Rock Flow dynamics
This live webinar will take place at:
11am – Perth
12.30pm – Darwin
1pm – Brisbane
1:30pm – Adelaide
2pm – Canberra, Hobart, Melbourne, Sydney
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Dinoturbation of the Broome Sandstone and a proposed new lithofacies and lithofacies association – SandStone Deformed Dinoturbation (SSDD)
Presented by Robert Seggie
Abstract
The presence of dinosaur footprints in the Early Cretaceous aged Broome Sandstone of northwestern Western Australia has been known for decades. Previous work has focussed on the discovery of sites, identification of species from the footprints and recording various forms of sedimentary deformation (dinoturbation). Prior global studies into dinoturbation deal with the identification of footprints, species recognition, and morphology, not their sedimentology. This talk reviews the extent and types of dinoturbation observed in the Broome Sandstone by the author as well as observations from engineering core behind outcrops and the key identification criteria of these features in petroleum core. Depositional settings and their relevance to preservation are also reviewed. Dinoturbation varies from individual footprints up to 1.4m in diameter to massive sauropod trackways, wallows and the total destruction of primary sedimentation over whole large outcrops. The sandstone substrate can be fluidised and mobilised to form broad synforms and tight antiforms that may be large enough to be identified on seismic. From this work a new lithofacies association SSDD (SandStone Deformed Dinoturbation) has been characterised and the key identification criteria have been determined to support more effective recognition of dinoturbation in the rock record, including the subsurface.