The understandings for sedimentary environment of Paleogene Huangxian Formation in Huangxian basin are different,or suggesting it as inland fresh water lacus,or considering it as coastal lagoon.

• 黄县盆地早第三纪黄县组的沉积环境,存在两种不同的认识,一种认为属内陆淡水湖泊沉积,另一种认为是滨海泻湖沉积。