# Cailleux index formula

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Wadell defined his roundness index as follows: (4) where is the radius of curvature that is smaller than or equal to the radius of curvature of the largest inscribed disk at a pixel on the boundary of the pebble silhouette and is the number of such radii. A retention index library for commonly encountered drugs and metabolites using tri-n-alkylamines as reference compounds, nitrogen-phosphorus detectors, and dual capillary chromatography, J. Anal. Toxicol., 11, 1987, 210-214. Roundness is an important indicator of the genetic affiliation of a clastic rock. The degree of roundness points to the range and mode of transport of clastic material, and can also serve as a search criterion in mineral exploration, especially for placer deposits. Alluvial debris in major rivers tend to exhibit a high degree of roundness ... Use the following formula to determine slope: Rise ÷ Run = Slope % OR (Change in elevation ÷ measured distance = slope %) e.g. 30 metres ¸ 100 metres = .3 or 30% . Calculating a slope steepness index for a map area. Stages: Calculate map area in km²; Place 10 X 10 grid overlay over map; Calculate % slope for each grid square A METHOD OF MEASURING AND PLOTTING THE SHAPES OF PEBBLES. By CHESTER K. WENTWORTH. INTRODUCTION. The studies of which this paper is a report of progress were begun by the writer at the University of Chicago in 1917 and have since been carried on under the auspices of the United States Geological