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These deposits are associated with fossil mudcrack prints in red beds (shales) where flood-plain muds had been exposed to the hot sun and lost their water contents, causing the mud to shrink and create the mudcracks.
Schensted and Titus' book Mudcrack Y & Poly-Y has a large number of boards for play of Y, all hand-drawn; most of them seem irregular but turn out to be topologically identical to a regular Y board.