A group of perhaps 180 chicken-sized Coelurosaurs (Skartopus) and Bantam to emu-sized Wintonopus were disturbed by the arrival of a single much larger carnivore - a theropod named Tyrannosauropus, which may have been up to 10 metres long with 50-centimetre feet. Skartopus and Wintonopus are thought to have stampeded past Tyrannosauropus, leaving thousands of footprints in the surrounding mudflat. The footprints were first discovered in the 1960s by station manager in the nearby Seymour Quarry. The Lark Quarry site is about 110 km south west of the western Queensland town of Winton.