陕西南部北大巴山地区早志留世滔河口组碱基性火山岩，分布层位稳定，岩性标志特征。
Alkalic volcanic rocks of the Early Silurian Taohekou Formation are distributed in the northern Dabashan area of the southern Shaanxi, with a stable horizon and evidently lithological indicators.
北大巴山地区已发现毒重石-重晶石矿床（点）达40余处，是现今世界范围上唯一的大型毒重石成矿带。
More than 40 witherite and barite deposits (or points) locate in northern Daba Mountains, which is a large and unique witherite metallogenic belt in the world.
北大巴山地区已发现毒重石-重晶石矿床（点）达40余处，是现今世界范围上唯一的大型毒重石成矿带。
More than 40 witherite and barite deposits (or points) locate in northern Daba Mountains, which is a large and unique witherite metallogenic belt in the world.
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