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80 Ma.jpg

At 80 Ma the Tasman Sea was opening.  The extension allowed volcanic material to move up through cracks in the earth to create many of the numerous dykes on the Wallarah Peninsula

R.D. Müller et al. / Earth and Planetary Science Letters 441 (2016) 60–70

50 Ma.jpg

The Tasman Sea at this time is open and Australia is moving North over a series of volcanic plumes.

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