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