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出露在湖南的早元古代变质岩，以前曾被误划入中元古代冷家溪群。究其岩性特征，确系一套“绿岩”组合。测得该“绿岩”类角闪片岩、斜长角闪片岩的Ｓｍ － Ｎｄ 等时线年龄为１ ８６０±１７ Ｍａ，因而创建“仓溪岩群”，辖“枫梓冲、斫木冲、水梁亭三个岩组”。“仓溪岩群”及其时代揭示，１ ８００ Ｍａ 前江南古岛弧业已存在。
Early metamorphic rocks exposed in Hunan have been mistakenly assigned to the Lengjuxi Group in the Proterozoic. Investigate its lithological characteristics, indeed a set of “green rock” combination. The Sm - Nd isochron age of this “green rock” type hornblende - amphibolite and plagioclase amphibolite was found to be 1860 ± 17 Ma, resulting in the creation of “Kuangxi Group of Rocks” , Liang Liangting three rock group. “ The ”Kuangxi Rock Group" and its era revealed that an arc of ancient islands in the south of the Yangtze River existed before 1800.