Devonian PeriodDevonian Period in Australia  Devonian, which follows the Silurian period, covers the time between 410 and 354 million years ago. Devonian is known for the first insects, the first seed-bearing plants and the first tetrapods (four-legged animals). In Australia, there was a final upheaval of land which pushed the ocean even further east of the eastern coast than it was during Silurian. With that, the times of marine depositions in inland eastern Australia had ended, and a widespread erosion of the continent started. There were many volcanic arcs in eastern Australia. The arcs of eastern Victoria, New England's area and north Queensland (between Charters Towers and Chillagoe) were mainly andesitic. Another, Calliope Arc, streched from north of Rockhampton south to Crafton. In central New South Wales, Eden and Snowy Mountains areas, the volcanism was andesitic and rhyolitic. In Western Australia, the arm of the sea that sterched to inland during Silurian, had major reefs and intertidal carbonate environments, limestones of which are today seen in the Geikie and Windjana Gorges near Fritzroy Crossing in the Kimberleys. Another phase of alluvial sedimentation in the area deposited the sandstones that have been eroded into the bizarre hills of Bungle Bungle Ranges. In the end of Devonian the climate started getting colder as the Gondwana continent was entering another icehouse phace during Carboniferous and Permian periods (Northern Hemisphere remained warmer).  Custom Search Looking for anything? Custom Search
Translate this page to your own language! NOTE: This website is written in British English, which is the English we use in Australia. You will find words like "traveller", "harbour" and "realise", and they are all correct in the language used in Australia.  Home | Site Map | Site Policies | About Us | Our Friends| ContactUs
|
