A triangular plot, also referred to as ternary graphs, are a triangularly-shaped representation of geographic information in which 3 variables are plotted on a 2-D graph. It graphically depicts the ratios of the three variables as positions on the triangle, in which the proportions of all three variables must sum to a constant. Triangular plots are used commonly in physical sciences to show the composition composed of three features or properties, such as rock type of shale, sandstone, and limestone for example. The above image is a simple model of a triangular plot of the mentioned example of the 3 apexes: shale, sandstone, and limestone, where shale is located at bottom left, limestone at bottom right, and sandstone at the top of the triangular plot.Any point that plots anywhere on one of the side lines or within the triangle itself represents a rock comprised of mixed types.
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