Nummulite biostratigraphy of the Eocene succession in the Bahariya Depression, Egypt: Implications for timing of iron mineralization Cherty ironstone hosted in Eocene marine carbonates: Tectonic and sedimentological controls on iron and silica formation Differentiation of ironstone types by using rare earth elements and yttrium geochemistry – A case study from the Bahariya region, Egypt Diagenetic origin of ironstone crusts in the Lower Cenomanian Bahariya Formation, Bahariya Depression, Western Desert, Egypt Biostratigraphy and stepwise extinctions of the larger foraminifera during Cenomanian (Upper Cretaceous) of Gebel Um Horeiba (Mittla Pass), west-central Sinai, Egypt Ironstone occurrences in the upper member of the Cenomanian Bahariya Formation, Bahariya Depression, Western Desert, Egypt Formation of ironstone crusts in the Cenomanian deposits of the Bahariya Depression, Western Desert, Egypt – Environmentally or diagenetically constrained? Clay mineralogy in Bahariya area, Egypt: Hydrothermal implications on fault-related iron ore deposits Mineralogical and geochemical characterization of radioactive minerals and rare earth elements in granitic pegmatites at G. El Fereyid, South Eastern Desert, Egypt Contribution to the stratigraphy and sedimentology of the Upper Jurassic – lower Eocene succession of the Mitla–El Giddi stretches, west Central Sinai, Egypt Depositional environments, provenance, paleoclimate, and tectonic setting of the Paleozoic–Lower Mesozoic siliciclastic sedimentary rocks at Um Bogma region, southwestern Sinai, Egypt: facies analysis and geochemistry