Mayayo, M.J. Yuste, A. Luzón, A. Corzo, A. Muñoz, A. Pérez, A. Soriano, A. Fe-rich microspheres pseudomorphs after pyrite framboids in Holocene fluvial deposits from NE Spain: Relationship with environmental conditions and bacterial activity Sediment. geol. 10.1016/j.sedgeo.2019.04.003 2019 2019