Figure F108. Close-up of irregular carbonate concretionary layers formed by replacement of mud or mudrock. These layers have a very high magnetic susceptibility and contain siderite, as determined by XRD analysis (Subunit 5B: interval 210-1276A-48R-3, 92-98 cm).

Figure F108. Close-up of irregular carbonate concretionary layers formed by replacement of mud or mudrock. These layers have a very high magnetic susceptibility and contain siderite, as determined by XRD analysis (Subunit 5B: interval 210-1276A-48R-3, 92-98 cm).