The non-contextual content of a WITSML Formation Marker. Prognosed measured depth. Prognosed true vertical depth. Sampled measured depth at top of marker. Sampled true vertical depth at top of marker. Bed Thickness. Formation exposed along the wellbore. Perpendicular thickness. Logged measured depth at top of marker. Logged true vertical depth at top of marker. Angle of dip with respect to horizontal. Interpreted downdip direction. Chronostratigraphic classification. Formation name. Description of item and details.