The tephra deposit at Urluia.

a. Photograph of the site. b. Stratigraphic section, showing luminescence ages and methods used. c. Magnetic susceptibility of the northwest and southeast loess profiles, showing frequency dependent (χ_fd) and magnetic low field susceptibility (χ_,) as functions of stratigraphy below and above the tephra layer. Bulk χ reflects the concentration of the magnetisable fraction in sediments; χ_fd reflects the relative amount of pedogenetic and diagenetic neo-formation of ultrafine Fe-particles.