Pset_GeoObsFoldAxis Properties for geological fold axis observations. IfcGeoScienceObservation/MAPPEDFEATURE IfcGeoScienceObservation/MAPPEDFEATURE FoldType Types of Geological Folds, which can be classified according to various factors independently. DeformationPhase Name or label for a geologic event such as a basin formation, compressional tectonic phase, orogeny etc. AzimuthHingeLine The azimuth of the hinge line of the fold. The azimuth is given in degrees in the range 0 to 360 degrees counted clockwise from true north and expressed as a three-digit number, e.g. 240 or 015. AzimuthHingeLineation The azimuth of the lineation. The azimuth is given in degrees in the range 0 to 360 degrees counted clockwise from true north and expressed as a three-digit number, e.g. 240 or 015. Plunge The angle of inclination of the fold axis with the horizontal as measured in a vertical plane.