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eruptive rock , extrusive rock
The porosity and permeability of typical basaltic rocks have been analyzed. Four effusive facies basalt layers and two volcanic necks with rock outcrops can be identified.
牛头山古火山历经四期喷发,地表可见四层喷溢相玄武岩层和两处火山颈相岩石出露。
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