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下石炭统测水组是湖南和广东两省的主要含煤地层之一,分布较广。由于它是一套海陆交互相沉积,含多种动植物化石,历来颇受人们重视。这套地层的创名人是田奇■ (1929),标准地点在湖南双峰县北面7.5公里的测水河西岸。当时名叫测水系,归入早石炭世维宪期早期,所属时代后来几经变动,近些年已由珊瑚、腕足类及植物化石确定为早石炭世晚维宪期,相当于大塘期晚期(许寿永,1982)。
The Lower Carboniferous Water Survey Group is one of the major coal-bearing strata in Hunan and Guangdong provinces and is widely distributed. Because it is a set of sea-land interaction facies, with a variety of animal and plant fossils, has always been very popular. The creator of this stratum is Tianqi ■ (1929), which is located on the west bank of the River of Water in 7.5 kilometers to the north of Shuangfeng County in Hunan Province. At that time, it was named Hydrothermal System and was classified as Early Carboniferous. In the early period of the constitutional period, the subordinate era changed several times later. In recent years, it has been confirmed by the corals, brachiopods and plant fossils as the Late Carboniferous Late Verde Constitution, (Xu Shouyong, 1982).