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近年来,广西区调队三分队在桂北资源地区开展一比五万中锋、百里村两幅区调工作时,在兴安、全州两县交界的苏家湾至楼底塘一带,于寒武系边溪组砂岩之上,下奥陶统白洞组灰岩之下,首次发现火山碎屑岩系。经地质填图和剖面研究,该岩系呈北东—南西向分布,长约15公里,厚约5—160余米,靠近苏家湾及楼底塘北东逐渐变薄尖灭,过度为白洞组下部灰岩。为使火山碎屑岩系有别于上下不同的地层,本文将其命名为楼底塘组,棣属于奥陶系底部。
In recent years, Guangxi Tiaoyuan third unit in the resources area of northern Guangxi to carry out one to fifty thousand centers, Baili two area adjustment work, in Xing’an, Quanzhou two counties at the junction of Sujiawan to Loudiatang area, in the cold Beneath the Beixi Formation sandstones of the Wudian System and under the limestone of the Lower Ordovician Baidong Formation, volcaniclastic rocks were first discovered. After geological mapping and cross-section study, the rocks are distributed in the NE-NS direction with a length of 15 km and a thickness of 5-160 m. White hole group lower limestone. In order to distinguish the volcaniclastic rocks from top to bottom in different strata, this article named it as Tangdian Formation and Di belonged to the bottom of Ordovician.