Description
From the text ... 'Charcoal is largely unaffected by fungi or other woods destroying organisms. Consequently, it will persist in soil for great periods of time and often turns up in archaeological diggings and paleobotanical studies. The identification of such charcoal is often desirable because it may provide a record of paleoclimatic changes or have significance as evidence of ancient cultural practices. Identification is possible because the anatomical features of the wood remain intact during the carbonization process.'