This is a methodological guide to the use of plant opal phytolith analysis in paleoenvironmental and paleoecological reconstruction. It is the first book-length treatment of this promising technique, which has undergone rapid development within the past few years and is now beginning to be used with considerable success by paleobotanists who serve the archaeological and paleontological research communities. It will be mandatory reading for all paleobotanists, paleoecologists, and archaeological scientists.