Collect 2 shovels full of soil to a depth of 8-12 inches in a large bucket at the desired location. Remove all rocks and loose vegetative matter-twigs, etc. Mix up the remainder thoroughly. Place 2-4 cups of this material into a jar. Add water to completely cover. Add non-foaming detergent (dishwasher soap). Shake vigorously until the material has gone into solution. Set jar aside and allow the material to settle into distinct layers.
Using a ruler determine the location of the top of the SAND (A), the SILT (B), and the CLAY (C). With a little math you can determine the percentages of each. Once you know the percentages of each, you can enter those numbers in the calculator at this link which will identify your type of soil.
4116 E. 15th Street,Tulsa, OK 74112-6198
Soil Type Classification