Sedimentary Thickness Trigonometry Guide
Field Purpose
Sedimentary thickness shows how much material was deposited between two bedding planes. Field teams use it to compare layers and map basins. A direct tape reading is not enough. Beds dip, slopes cut across layers, and vertical differences can mislead quick notes.
Trigonometric Approach
Trigonometry helps convert observed values into true thickness. The key idea is simple. True thickness is measured at right angles to bedding. Most field readings are not taken that way. They must be adjusted by sine or cosine factors based on dip and slope.
Calculator Scope
This calculator supports common situations. You can enter horizontal outcrop width and bed dip. You can convert vertical thickness to true thickness. You can also handle slope distance with same or opposite dip direction. Each mode keeps the calculation clear and shows the applied formula.
Input Discipline
Good input control is important. Angles should use degrees. Length units should stay consistent. A width entered in meters returns a thickness in meters. A width entered in feet returns a thickness in feet. The tool reports complementary values, including vertical thickness, horizontal width, and ratio checks.
Example Review
Use the example table before entering your own data. It shows how different modes change the answer. A steep dip gives a larger true thickness from the same horizontal width. A shallow dip gives a smaller value. When slope and dip move in the same direction, the angular difference becomes important.
Exports and Notes
The exported CSV file helps store numerical results. The PDF option creates a field summary. Both support reports and class work. Always compare the answer with your geologic sketch. Check bedding attitude, measurement direction, and unit consistency before final use.
Practical Limits
This calculator is an estimating aid, not a substitute for field judgment. Complex folds, faults, unconformities, and irregular contacts can change the geometry. Use local mapping standards when results support engineering, mining, or environmental decisions.
Better Field Checks
For stronger results, measure strike and dip. Note whether the traverse is perpendicular to strike. Record slope direction. Repeat measurements where exposure allows it. Small angle errors can affect thin beds, steep beds, and long traverse distances. Clean notes make interpretation safer during review.