The Gengjiajie Formation is in the upper part of the Eogene in the Fushun coal field. The formal nomenclature of the formation firstly appeared in the literature in 1978. The primary section of the formation is unfossiliferous.是什么意思_The Gengjiajie Formation is in the upper part of the Eogene in the Fushun coal field. The formal nomenclature of the formation firstly appeared in the literature in 1978. The primary section of the formation is unfossiliferous.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句