Gucheng formation which is the early deposit of Guanzhuang group is composed mainly of conglomerate rock with conglomerate-bearing sandstone and sandy mudstone.
其早期形成的固城组以砾岩为主，夹含砾砂岩及砂质泥岩。
Therefore, river evolution has very vital initiative and promoting effects on the formation and development of sand-dune groups and sandy land in natural conditions.
这些足以说明，在自然状况下，河流演变在沙丘群和沙地形成演化中起着非常重要的促进作用。
The Neoproterozoic Jiuliqiao Formation in Huainan region consists of sandy and silty limestone, stromatolite limestone and dolomitic limestone.
安徽淮南地区新元古代九里桥组主要由砂质、泥质灰岩，叠层石灰岩和白云质灰岩组成。
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