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Strike is the compass direction of a horizontal line on an inclined rock surface such as a bedding plane or fault. Dip is the angle that surface makes with the horizontal, measured at right angles to strike, together with the direction it slopes down. Together, they describe the orientation of a plane in space.

Draw structure contours for the surface, measure the horizontal distance between two contours at right angles using the map scale, and divide the height difference by that distance. The dip is the angle whose tangent equals this value. Dip direction points from the higher contour towards the lower one.

Apparent dip is the dip of a plane measured in any direction other than the true dip direction, so it is always smaller than the true dip. It is calculated from tan apparent dip equals tan true dip multiplied by the cosine of the angle between the section line and the dip direction.

A structure contour is a line on a map joining points of equal height on a geological surface, such as the top of a rock bed or a fault plane. Structure contours run parallel to strike, and their spacing shows the dip: closer contours mean a steeper dip. They are used to trace outcrops and calculate dip.

The rule of Vs describes how the outcrop of a dipping bed forms a V shape where it crosses a valley. If beds dip upstream, or dip downstream less steeply than the valley floor, the V points upstream. If beds dip downstream more steeply than the valley floor, the V points downstream. Horizontal beds follow contours.

A fault often appears as a line that cuts and offsets outcrop boundaries, so rock units suddenly end or repeat. Rocks of different ages may lie side by side, and beds may be missing or repeated across the line. Displaced structure contours on either side allow you to measure the throw.

In a normal fault, the hanging wall moves down relative to the footwall, which stretches the crust and is common in extensional settings. In a reverse fault, the hanging wall moves up, shortening the crust under compression. A low-angle reverse fault is called a thrust fault.

Throw is the vertical displacement of a rock layer across a fault, measured as the height difference of the same horizon on either side. Heave is the horizontal displacement, measured perpendicular to the fault's strike. For a dipping fault, heave equals throw divided by the tangent of the fault's dip.

Folds show as repeated outcrops of rock units arranged symmetrically about an axis. In an anticline, the oldest rocks are in the core and beds dip away from the axis. In a syncline, the youngest rocks are in the core and beds dip towards the axis. Plunging folds give V or U-shaped outcrop patterns.

An unconformity is a surface representing a gap in the geological record, where erosion or a pause in deposition happened before younger rocks were laid down. On a map, younger beds cut across the boundaries of older, often tilted or folded, rocks. Types include angular unconformity, disconformity and nonconformity.

List events in time order, from oldest to youngest, using the principles of superposition, cross-cutting relationships and included fragments. Typical steps include deposition of each unit, folding or tilting, faulting, erosion, deposition above an unconformity and intrusion of igneous bodies. Give evidence from the map for each event.

Field geologists use a compass-clinometer to measure strike and dip, a hand lens, a geological hammer, a GPS or map app for location, a field notebook, base maps or aerial images, and acid for testing carbonates. Many now use digital mapping apps alongside paper maps, recording data in GIS.

Geological mapping and structural geology are core parts of B.Sc and M.Sc Geology in India, geoscience degrees in the UK with independent mapping projects, US structural geology and field camp courses, and A-Level Geology. Mining, civil and petroleum engineering courses also include map interpretation and cross sections.

Yes. A geology tutor explains how to draw structure contours, calculate dip and fault throw, trace outcrops and construct cross sections, and checks your geological history. You complete the maps and reports yourself during the session, so you understand each method and stay within your university's academic integrity rules.