Dating of volcanic rocks nsw

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On the east coast the short, steep rivers have not regressed as much as would be expected, some having eroded headward by about 100 km in about 60 My.It is only in very wet years that the water reaches all the way to Lake Eyre, especially as a lot of the water is absorbed into the dry channel beds and evaporates in the hot dry air of the interior long before it reaches Nearly all of the area inland of the peripheral drainage systems generates less the about 3 cm per year of run-off.As aridity has increased any rivers that had existed on the low gradient sandy surfaces of the shield areas have disintegrated or disappeared entirely.There are 3 major structural components, the stable Western Shield, the gently warped Central Basin, and the ancient orogony of the Eastern Uplands, which have been rejuvenated by differential uplift in Tertiary and later times.The result is the vast plains and plateaux of the Australian landscape.

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