Western Australian Ichthyosaurs – The last of their kindVideo | Updated 7 years ago Dr Mikael Siversson, Curator of Palaeontology, Earth & Planetary Sciences Learn about the giant, dolphin-like, marine reptiles ‘Ichthyosaurs’ that lived during the 'age of the dinosaurs'. Global warming accompanied by a rapid sea level rise, 92 million years ago, deprived the deeper parts of the oceans of oxygen and may have caused the extinction of the deep-diving ichthyosaurs. Chevron are a presenting partner for the "In the Wild West" lecture series.