Linxiang Fm
Type Locality and Naming
The type section is at Wulipai in Linxiang, Hunan. The Linxiang Fm is derived from the Linxiang Limestone proposed by Mu Enzhi and Sheng Jinzhang in 1948 and published in 1954. In 1962, Zhang Wentang renamed it first the Linxiang Limestone Fm then the Linxiang Fm which was subsequently followed. The Meijiang Fm, separated from the lower part of the Linxiang Fm by Nanjing Institute of Geology and Paleontology, Chinese Academy of Science in 1974 based on the fauna, should be not maintained.
Synonym: (临湘组）
Lithology and Thickness
The Formation is dominated by gray, grayish yellow and grayish green medium- to thick-bedded nodular limestone, argillaceous limestone or nodular marl with an increasing argillaceous sediment or mudstone at the top. In the type area, the Linxiang Fm is 20 m thick.
Relationships and Distribution
Lower contact
It rests conformably on the limestone with polygonal cracks of the Baota Fm
Upper contact
It is conformably overlain by the grayish green-black shale at the base of the Wufeng Fm
Regional extent
The Linxiang Fm, with a persistent lithology, is exposed in northern Guizhou and western Sichuan (4-15 m thick), northwestern Hunan (4-26.5 m thick), eastern Sichuan and western Hubei (12-15 m thick), eastern Hubei (1.2-18.5 m thick), and Nanzheng (2.7 m thick), Fucheng (3.3 m thick) and Xixiang (2.4 m thick) of southern Shaanxi.
GeoJSON
Fossils
In eastern Yangtze George, apart from trilobites, conodonts of Protopanderodus ? insculptus range-assemblage also have been found from the Linxiang Fm. It is equivalent to Pleurograptus linearis zone to Dicellograptus complanatus zone or a part of them. In 1959, Lu Yanhao used the term Linxiang Limestone, and established the trilobite Nankinolithus nankinensis zone.
Age
Depositional setting
Additional Information