Typical characteristics of subaerial volcanic rocks include rhyolitic structure, culurrinar joints car bonized wood/silicified wood, angular unconformity contact with underlying strata.

• 其陆上喷发火山岩的典型标志为流纹构造、柱状节理，含炭化木／硅化木，与下伏地层呈角度不整合接触。