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At 130 Ma Eastern Australia was being compressed. This caused significant volcanic activity in the Sydney Basin with over 130 Diatremes, volcanic domes and lava sheets being produced.
R.D. Müller et al. / Earth and Planetary Science Letters 441 (2016) 60–70
Australia had begun to split from Antarctica and a collision between micro plates at New Zealand caused the Tasman Sea to open.
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