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URL: Ironstone at wikipedia
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An ironstone concretion found in a quarry in southern Saskatchewan
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These are very hard and high in iron oxide. They are found in the Battle Formation across Saskatchewan. Plainsman Clays extracts the bottom part of the Battle layers, just above the Whitemud Formation layers, about 1-2' thick, and stockpiles it as the material A1 (that clay is added to reduction fired bodies to impart speckle, color and plasticity). The A1 contains thousands of these concretions, ranging in size from lemons to toasters. When first mined they are hard and very difficult to break with a hammer. But upon aging in the sun they dehydrate slowly and crumble into small lumps. These layers are the same as those in which the worlds largest T.Rex was found (learn more at the T.rex Discovery Centre).
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