Age and origin Uluru

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rain water flows off uluru along channels marked dark algae, forming small ponds @ base


the mutitjulu arkose believed of same age conglomerate @ kata tjuta, , have similar origin despite rock type being different, younger rocks exposed east @ mount conner, , unrelated them. strata @ uluru vertical, dipping south west @ 85°, , have exposed thickness of @ least 2,400 m (7,900 ft). strata dip below surrounding plain , no doubt extend beyond uluru in subsurface, extent not known.


the rock sand, deposited part of extensive alluvial fan extended out ancestors of musgrave, mann , petermann ranges south , west, separate nearby fan deposited sand, pebbles , cobbles make kata tjuta.


the similar mineral composition of mutitjulu arkose , granite ranges south explained. ancestors of ranges south once larger eroded remnants see today. thrust during mountain building episode referred petermann orogeny took place in late neoproterozoic cambrian times (550–530 ma), , mutitjulu arkose believed have been deposited @ same time.


the arkose sandstone makes formation composed of grains show little sorting based on grain size, exhibit little rounding , feldspars in rock relatively fresh in appearance. lack of sorting , grain rounding typical of arkosic sandstones , indicative of relatively rapid erosion granites of growing mountains south. layers of sand horizontal when deposited, tilted near vertical position during later episode of mountain building, possibly alice springs orogeny of palaeozoic age (400–300 ma).








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