Abstract: Abstract Pseudospherulitic fibrous calcite (PFC) has been found as a major constituent (85–90%) within thin massive limestone beds of the Quaternary mudflat-shallow lacustrine facies association (1.5–2 m thick) that forms part of combined facies associations of the Quaternary clastic-carbonate unit (25–30 m thick) at Bir-Karawein area in the Farafra Oasis, Western Desert, Egypt. The thin massive limestone beds (2–5 cm thick) are devoid of pedogenic features and marine fossils. They form a rhythmic cyclic succession with thin massive mud...
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