(Table 3) Petrographic characteristics of tephra layers from the Izu-Bonin Fo...
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= present, ++ = abundant, - = not observed
= 代表存在(present),++ 代表丰富(abundant),- 代表未观测到(not observed)

= present, ++ = abundant, - = not observed
= 代表存在(present),++ 代表丰富(abundant),- 代表未观测到(not observed)