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Phosphatized sclerites of Chancelloria and Allonnia are described from the Henson Gletscher Formation (Cambrian, Miaolingian Series, Wuliuan Stage) of North Greenland and the lower Cambrian of Siberia. They preserve diagenetic, unusually large, elongate crystals within the internal cavity (lumen) that maintain the imbricate lamellar structure of the original microstructure of the aragonitic sclerite wall.
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Peel et al. (2024) studied this question.
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