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. 2024 Jan 2;14:259. doi: 10.1038/s41598-023-50975-8

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© The Author(s) 2024

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(A) Thin section NG19 (3); 2.5 × magnification: (B) Abundant clay deposits in PPL; (C) Clay infilling void space in PPL; 5 × magnification: (D) Granostriated clays surrounding clasts in PPL; (E) in XPL; 2.5 × magnification: (F) Highly phosphatic deposits derived from guano; 5 × magnification: (G) Gypsum fragments with lenticular crystals in PPL. Figure (B–G) Yellow line indicates 1 mm in size and green line indicates 500 μm in size.