Guanzishan Fm

Named by Zheng Guobao and others in 1963. The named section is located in Guanzi Mountain, Leiyang, Hunan; the reference section is located in Qijia-Yijiachong, Leiyang, Hunan. Uppermost formation in Daye Gr.

Synonym:

It is mainly composed of miscellaneous sandstones, siltstones, mudstones and shales. Lower member (Zhujia member) is mainly composed of yellow and gray-green quartz sandstone and shale, which are mostly interbedded, sometimes intercalated with a small amount of siltstone, mica-feldspar quartz siltstone, or quartz-feldspar siltstone and mud siltstone, 143～471 m thick. Middle member (Yijiachong member) is mainly composed of purple-red, gray-green and yellow-green shale intercalated with mica-quartz siltstone, with gray-green to brown-green giant thick-layered quartz fine sandstone at the bottom. Upper member (Yijiachong member) is mainly composed of purple-red, gray-green and yellow-green shales with mica-bearing quartz siltstone, the bottom is gray-green to brown-green giant thick-layered quartz fine sandstone, and the central shale is sandwiched by marl, 71-258 m thick.

The lower part of the lower section contains Ammonoids Hemilecanites sp., Kashmirites sp., Aspenites sp. etc., the upper part contains bivalves Unionites aff. fassaensis, Claraia aff. pinkhandana, C. clarai, C. aff. stachei, Posidonia aff. periodicis; the lower part of the upper section contains the bivalves Pteria cf. murchisoni, Gervillia aff. costata, G. subpannonica and Ammonoids Hemilecanites cf. aiscus, the upper part contains the bivalve Unionites aff. fassaensis brevis.

This group is a shoreline and shallow marine sediment.