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腾冲地区的勐洪群地层,最早为方仲景等命名(1961)。当时由于未采获化石,将其与缅甸的庄马峪系对比,认为其时代可能相当于震旦系一寒武系(?)。1965年云南省地质局区域地调查队在进行1∶100万地质调查过程中,在该套地层中找到少量三叶虫、腕足类碎片,同时结合地层具有轻微变质现象,将勐洪群时代确定为奥陶—志留纪。1978年—19 79年我们对方仲景所测的勐洪群命名剖面进行了研究,发现剖面上构造比较复杂,但在剖
Meng Hongqung Tengchong area strata, the earliest named Fang Zhongjing (1961). At that time, because of the lack of fossils, compared with the Zhuangmayu system in Burma, the time was probably equivalent to the Sinian-Cambrian system (?). In 1965, the regional geological survey team of Yunnan Geological Bureau found a small amount of trilobites, brachiopods and debris in the 1: 1 million geological survey during the 1: 1 million geological survey. At the same time, combined with the slight metamorphism in the strata, For Ordo - Silurian. From 1978 to 1979, we conducted a study on the named section of Meng Hongqun measured by Zhongjing and found that the structure on the section is rather complicated,