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image: Composite Dyke No.61, showing internal contact along southern margin between early hypersthene basalt and later feldspar porphyry (in which plagioclase phenocrysts may be 2cm); exposure at head of beach.
Composite Dyke No.61, showing internal contact along southern margin between early hypersthene basalt and later feldspar porphyry (in which plagioclase phenocrysts may be 2cm); exposure at head of beach.
 
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