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Exhibitions > underworld by John Jackson 210511



Waiting on Wivenhoe

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Waiting on Wivenhoe

Wivenhoe Dam is not only Brisbaneís water supply, but also, its safeguard in the event of  flooding. The painting was inspired by the contrasting seasons of drought and heavy rain. Over recent times people living in the Brisbane Valley have been either waiting for Wivenhoe to fill, or waiting on it to overflow. The painting shows a dark, ominous, Lake Wivenhoe with red edges in the centre and lower right. Also in the lower right is a set of traffic lights on amber, waiting to change to either red or green.

 

Beneath the dam and traffic lights are the rocks of the Wivenhoe region. Folded, deep sea, marine rocks, greater than 250 million years old are shown as folds on the right hand side. Immediately left of these marine rocks are sediments containing volcanics where small glass shards display cross-sectional triangles or longitudinal scythe shapes. To the left of the volcanics and underlying most of Wivenhoe Dam are the basal, yellow to brown conglomerates of the Esk Rift Valley. In the top left hand corner, glass shards can again be seen in a paler coloured version of the volcanics together with large, mauve to purple rocks that have been blown out of ancient volcanoes. These volcanic rocks have been pushed to the surface by younger volcanics represented by orange lava flows at the top left.

 

As the Rift Valley filled, the streams decreased in energy and the deposition of pebbles was replaced by the deposition of sands. These can be seen as the orange dots along the bottom and lower left hand sides.




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