古火山是指新生代以来没有活动过的火山。由于长期受到侵蚀，外形已难以辨认。古火山属于火山三种类型（活火山、死火山、休眠火山）中的死火山类型。
成因与古火山机构、次火山岩有密切关系。
Its origin has close relation with ancient volcanic agencies and sub-volcanic rocks.
火山岩岩性和岩相是控制松辽盆地古火山机构类型及形态的主要因素。
Volcanic lithology and lithofacies are the main factors that control the types and forms of the volcanic apparatus in the Songliao Basin.
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。
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.
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