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r~ <br />U <br />ROCK CLASSIFICATION/DESCRIPTION SYSTEM FOR BRUCE PARK DAM SITE <br />CLASTIC SEDIMENTARY ROCK CLASSIFICATIONS <br />r l <br />SILTY SANDSTONE Mostly sand-sized particles, less than 15 percent fines. <br />SILTSTONE Mostly non-plastic fines, less than 15 percent sand-sized <br />particles. <br />CLAYEY SILTSTONE Mostly non-plastic fines, 15 to 50 percent low to medium <br />plastic fines, less than 15 percent sand-sized particles. <br />SILTY CLAYSTONE Mostly low to non plastic fines, less than 15 percent <br />sand-sized particles. <br />CLAYSTONE Mostly medium to high plastic fines, less than 15 percent <br />sand-sized particles. <br />i• <br />