Static cord, static rope, webbing and even slings are acceptable anchoring means. On lead, you can even build the anchor out of your dynamic rope! Learn them all and have them in your "tool-box" of climbing knowledge and you can practice them all when you build your anchors. There are often trade offs with the varying means. If the anchor is built with a stable master point by good extension angles, the quartzite edges at Devils Lake become a non-issue.