Apart from lithics, pottery, as well as the teeth, many other types of wools and remains, which may be closely entangled with plant materials, can be found at archaeological sites, such as bamboo or wooden tools, bone and antler tools, teeth tools, mussel tools and the like. The laboratory receiving the specimens was detected residue plant surface. However, please head that some specimen influenced by all kinds of natural wearing during burial will produce different degrees of weathering traces. When such severe weathered specimens are examined in the preliminary sampling process, some particles may fall apart due to the ultrasonic vibrations and thus bring about slight loss of the sample. Please note that the extent of the loss is inestimable before the examination is conducted.