Weathered crust and sedimentary intercalation are indicative of volcanic intervals.Extrusive and volcanogenitic sedimentary facies are the end-members of an eruption cycle.

 
  • 風(fēng)化殼層之上和沉積夾層之上的火山巖是新的噴發(fā)旋回的開(kāi)始,而火山沉積相和侵出相的出現往往標志著(zhù)一個(gè)火山噴發(fā)旋回的結束。
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