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Rights: University of Waikato
Published 12 March 2018 Referencing Hub media
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Scientists are able to ‘read’ layers of sedimentary rock by using a technique called relative dating. This animated video demonstrates how sedimentary rock features, like the cliffs near Whanganui, were formed, stacked, eroded and tilted by tectonic movement before new rocks were formed on top.

Note that this video does not have a voiceover.