8-20

Fig.8-20 The dating result of Pentremites sample (Concordia plot)

As a result of the U-Pb isotopic analysis of the Pentremites sample, the sample was dated 332 Ma, corresponding to almost the middle of the age range of this specimen (∼339 to ∼318 Ma). The 15 pink solid circles in the right photograph show the laser-irradiated points selected using the prior elemental imaging map (Fig.8-19).

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