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吉中呼兰镇一带分布的轻变质岩系称呼兰群，曾划分为黄莺屯组、小三个顶子组和北岔屯组，对其划分和时代一直分岐较大。本文重新厘定了黄莺屯组，其主要为片麻岩、变粒岩、片岩等夹大理岩和石英岩，小三个顶子组由大理岩夹片岩和变粒岩组成；北岔屯组由大理岩、钙质砂岩和板岩组成，时代为晚志留世。北岔屯组在变质程度、岩性组合和时代上与另两组都有很大差别。因此，呼兰群仅包括黄莺屯组和小三个顶子组，时代为寒武－奥陶纪
The light metamorphic rocks distributed in Hulan Town, Ji Zhongzhong Town are called Huanglan Group and have been divided into Huangyintun Formation, small three top subgroups and Beichartunity Group, and their division and times have been diverged a lot. This paper redefined the Huangyintun Formation, which is mainly composed of gneiss, granulite, schist and other folder marble and quartzite, the small three top subgroup consists of marble clip schist and granulite; Beicharten group consists of Dali Rock, calcareous sandstone and slate, the Late Gushi remains. Beitatun Formation in the degree of metamorphism, lithology and the times and the other two groups are very different. Therefore, the Hulan Group only includes the Huangyingtun Formation and the small three top subgroups, and the age is Cambrian-Ordovician