中溝組是位於中國甘肅紅柳峽、新民堡及祁連山前盆地的白堊紀地層，隸屬於新民堡群，1976年由甘肅省地質局地質力學區域地質測量大隊牛紹武等命名。該地層以灰綠、黃褐、黃灰、磚紅等色碎屑岩（上部），紫紅色巨厚層礫岩（下部）為主，間夾泥質粉砂岩（下部）。[1]
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