They mainly consist of sandstone,in which quartzarenite and litharenite are dominant and arkose is lack.
碎屑
以砂
，其中又以石英砂和屑砂，
少长石砂。
They mainly consist of sandstone,in which quartzarenite and litharenite are dominant and arkose is lack.
碎屑以砂，其中又以石英砂和屑砂，少长石砂。
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