Changes

''Dip isogons,'' or contours of equal dip in the plane of the section ([[:Image:Land_rig_example_drawing.png|Figure 3]]),<ref name=Ramsay_1967>Ramsay, J. G., 1967, Folding and fracturing of rocks: New York and London, McGraw-Hill, 568 p.</ref> can be used to fill in the geological section. The isogons can be located from projected dipmeter data and projected or correlated between the wellbores following the rules described by Ramsay and Huber.<ref name=Ramsay_etal_1987>Ramsay, J. G., and M. I. Huber, 1987, The techniques of modern structural geology__Volume 2, in Folds and Fractures: Orlando, FL, Academic Press, 700 p.</ref> A series of dip segments along the various isogons helps the geologist sketch the fold profiles. Interpolation between the isogons can also be carried out using the dip domain methods previously described or by cubic spline interpolation.<ref name=McCoss_1987>McCoss, A. M., 1987, Practical section drawing through folded layers using sequentially rotated cubic interpolators: Journal of Structural Geology, v. 9, p. 365-370.</ref>

''Dip isogons,'' or contours of equal dip in the plane of the section ([[:Image:Land_rig_example_drawing.png|Figure 3]]),<ref name=Ramsay_1967>Ramsay, J. G., 1967, Folding and fracturing of rocks: New York and London, McGraw-Hill, 568 p.</ref> can be used to fill in the geological section. The isogons can be located from projected dipmeter data and projected or correlated between the wellbores following the rules described by Ramsay and Huber.<ref name=Ramsay_etal_1987>Ramsay, J. G., and M. I. Huber, 1987, The techniques of modern structural geology__Volume 2, in Folds and Fractures: Orlando, FL, Academic Press, 700 p.</ref> A series of dip segments along the various isogons helps the geologist sketch the fold profiles. Interpolation between the isogons can also be carried out using the dip domain methods previously described or by cubic spline interpolation.<ref name=McCoss_1987>McCoss, A. M., 1987, Practical section drawing through folded layers using sequentially rotated cubic interpolators: Journal of Structural Geology, v. 9, p. 365-370.</ref>

[[File:Land rig example drawing.png|left|thumbnail|'''Figure 3.''' Cross section through an asymmetrical ramp anticline, Whitney Canyon field, Wyoming, with SCAT and isogen data superimposed. Uncomformities, axial planes, and inflection surfaces have been identified from the diameter data and projected away from the well bore. Isogens are contours of equal dip<ref name=Ramsay_1967></ref> and can constrain the shapes of folds in section. (From Lammerson, 1982.)]]

[[File:Land rig example drawing.png|thumbnail|left|'''Figure 3.''' Cross section through an asymmetrical ramp anticline, Whitney Canyon field, Wyoming, with SCAT and isogen data superimposed. Uncomformities, axial planes, and inflection surfaces have been identified from the diameter data and projected away from the well bore. Isogens are contours of equal dip<ref name=Ramsay_1967></ref> and can constrain the shapes of folds in section. (From Lammerson, 1982.)]]

===Relationship of folding and faulting===

===Relationship of folding and faulting===