Two planes intersect along a line. Axial planar foliation and bedding define an intersection lineation that is perpendicular to the fold axis so we can use to determine how folds plunge

Two planes intersect along a line. Axial planar foliation and bedding define an intersection lineation that is down dip and can tell us if the fold is normal or reverse

Two planes intersect along a plane. Axial planar foliation and bedding define a surface that is parallel to axial surface

Two planes intersect along a line. Axial planar foliation and bedding define an intersection lineation that is parallel to the fold axis so we can use to determine how folds plunge