The Dashuigou Formation (simplified Chinese: 大水沟组; traditional Chinese: 大水溝組; pinyin: Dàshuǐgōu Zǔ) is a geological formation in Inner Mongolia, north China, whose strata date back to the Early Cretaceous period.

The hadrosauroid Probactrosaurus has been reported from this formation,[1] although it actually derives from the Miaogou Formation, which has outcrops nearby.

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