URL: T.rex Discovery Centre - Town of Eastend
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An ironstone concretion found in a quarry in southern Saskatchewan
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These iron-rich concretions occur in the Battle Formation across Saskatchewan. Plainsman Clays mines the lower part of the Battle Formation, just above the Whitemud Formation, where a 1–2 foot layer is stockpiled as A1 clay. This clay is added to reduction-fired bodies to provide speckle, color and plasticity. The A1 contains thousands of these concretions, ranging in size from lemons to toasters. When freshly mined they are extremely hard and difficult to break with a hammer. After weathering (repeated wetting and drying, oxidation, shrinkage, and freeze-thaw), they gradually break down into small fragments that can be crushed and dispersed during clay processing. These are the same Battle Formation beds exposed in the Eastend, Sask. area that yielded the Tyrannosaurus rex fossil “Scotty,” displayed at the T. Rex Discovery Centre there.
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