Soil Scientist Patrick Cowsert visited Grade 3 on May 11, 2004. Updated Thursday, May 13, 2004 Mr. Cowsert brought a core sample of soil approximately 7 feet long. He also brought particle samples of silt, sand and clay. They are shown here magnified at M50. soil scientist Patrick Cowsert soil survey maps core sample of soil wetting the soil sample sample soil colors and textures recording soil sample data soil sample color chart silt sand clay Created with Photo Finale