For a good overview of the Chinese language in general, see the
Scientific American article in pfd format
Chinese Language; esp. the chart
Historical Development of Pictographic Characters on p. 11 (p. 61 in original doc.).
Some early pictographs on pottery such as those from archeological site 4th-5th millenium bce in Hemudu 河姆渡 along the lower Yanzi River in Zhejiang province are evidence that picture representations of objects existed prior to the early writings attested in the 150,000 and some pieces of turtle shell and bone inscriptions 甲骨文 of the mid-to-late Shang dynasty, ie. ca. 1400-1100 BCE.
< photo 1. earthen basin with flower or rice (?) engavings from Hemudu 河姆渡 >
(note on the origin of Chinese pottery and rice cultivation: Whereas the earliest pottery are from southwestern Japanese Islands (Caves at Fukui and Kamikuroiwa, both from ca. 10,000 bce) the earliest Chinese ceramic vessels are from Yuchanyan 玉蟾巖 (Lixian 澧縣, Hunan province 湖南省) with also the earliest known rice cultivation dated to around 10,050 to 8,000 years BCE. If the pictograph of the plant in photo 1. is rice, then the variety must have been the domesticated kind, and should have had a long history of cultivation in the range of 2-5 thousand years prior to the discovered pot. For recent archeological excavations and studies of rice cultivation and pottery from Yuchanyan and other sites, see
IV. Xianrendong & Diaotonghuan, Jiangxi, and Yuchanyan, Hunan, reflect a mid-Yangtze rice origin.)
< photo 2. earthen bowl with a boar or domesticated pig from Hemudu 河姆渡 >
Some pottery from Banpo, Dawenkou, and other pre-Shang cultures also record interesting pictographic emblems on pot shards predating the turtle shell and bone inscriptions. They had already experienced much refinement and accumulated writing conventions some of which are later codified as the six principles of word origin and usage 六書 (象形, 指事, 會意, 形聲, 轉注, 假借) appearing in 鄭衆's 周官. Nevertheless certain turtle shell and bone inscription 甲骨文 conventions were not current by the
Han dynasties, such as combining two syllables as one graph 合文 or writing in mirror images without discrimination.