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In page Hilda mega-bonebed:

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Their eventful taphonomies suggests that the centrosaur carcasses were permanently buried by a later flood rather than the one that drowned them.[8] These floods may actually have been common enough to be the primary means by which sediment was deposited in the Hilda area during the Cretaceous.[5] Eberth Brinkman and Barkas observed evidence that the sediment was deformed and contorted near the top and bottom before it hardened into the mudstone it is today.[9]