What is the best dirt for a baseball infield?

The ideal dirt for recreational baseball and softball infields is composed of 70% sand and 30% silt and clay combined.  Professional and collegiate level fields typically prefer 60% sand and 40% silt and clay.  Both types of infield dirt should be free from any debris including small rocks, and red is the preferred color of choice.  This dirt if typically provided from a supplier, such as River Sand, Inc.