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。
The regional classification and distribution, formation process and developing trends of sandy and water eroding desertification are discussed mainly in this paper.
本文仅对北方沙质荒漠化、水蚀荒漠化两种主要的荒漠化类型的区域地质分布、成因及其发展趋势进行探讨。
The regional classification and distribution, formation process and developing trends of sandy and water eroding desertification are discussed mainly in this paper.
本文仅对北方沙质荒漠化、水蚀荒漠化两种主要的荒漠化类型的区域地质分布、成因及其发展趋势进行探讨。
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