Puddingstone is a conglomerate or breccia (pieces of other rocks mixed in to a sandy or muddy matrix) that formed from glaciers carrying the material and then depositing it when the glacier melted. This is called glacial till geologically. The most well known puddingstone is white and mostly contains jasper fragments, from Michigan. Occasionally rare minerals like diamonds and gold are found in Michigan puddingstone,, carried down from Canada. Puddingstone can be any color and variety of conglomerate, however.

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