Devonian Period

Devonian period is known for the first insects.

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).
 
Calamites and Drepanophycus Populate Lowlands Near the Brackish Waters of an Inland Sea
Poster by AllPosters. Click on thumbnail to buy

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.

The First Trees Begin to Populate Earth Near the End of the Devonian Period
Poster by AllPosters. Click on thumbnail to buy

With that, the times of marine depositions in inland eastern Australia had ended, and a widespread erosion of the continent started.

Asteroxylon Was a Primitive Plant That Flourished During the Early Devonian Period
Poster by AllPosters. Click on thumbnail to buy

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.

A Late Devonian Ichthyostega Emerges from Waters of a Floodplain
Poster by AllPosters. Click on thumbnail to buy

In central New South Wales, Eden and Snowy Mountains areas, the volcanism was andesitic and rhyolitic.

Several Bothriolepis Emerge from a Shallow Tributary onto Dry Land
Poster by AllPosters. Click on thumbnail to buy

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 Kimberley. Another phase of alluvial sedimentation in the area deposited the sandstones that have been eroded into the bizarre hills of Bungle Bungle Ranges.

A Close-Up of a Three Foot Long Ichthyostega from the Late Devonian Period
Poster by AllPosters. Click on thumbnail to buy

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).
 












You Are Secure!





Bookmark and Share


[?] Subscribe To This Site

XML RSS
follow us in feedly
Add to My Yahoo!
Add to My MSN
Subscribe with Bloglines