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More model informationConcretion (siderite?) approx 35mm x 30 mm x 8mm, found in a large jacket from a late Cretaceous excavation near Marmath, ND. trying to determine if it is an endocast or whether the surface patterning was due to crystalline formation. (The jacket also contained approx. two dozen vertebrae, skull elemants, scapula and coracoid, pubis and podial bones)
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