Where is the secret code? (Hint: check the L shape cut)
The Songze culture was a later stage of the Majiabang culture (which emerged around c.5000 BCE) and before Liangzhu Culture materialized in the lower Yangzi region around c.4000 BCE and was given its name after the site of Songze in Shanghai. The general dates in which the Songze culture flourished are usually given is between 3400 – 3300 BCE and 
it was these people that are considered to be one of the ancestors of the Shanghai people. Songze Site is the archaeological site of the Neolithic Age and the Spring and Autumn Period (770-476BC). Its cultural relics are divided into three levels according to its stratum: the lowest level but of the highest archaeological value of the three belongs to the Neolithic Age, unearthed relics including storage pits and production tools; the middle level is the tombs of the Matriarchy clan society; and the upper level is the relic of late Western Zhou Dynasty (11th century-771BC) and the Spring and Autumn Period, 
including pottery, porcelain, stoneware, and some bronze. The hole drilling pattern which serves as an important aspect in the authentication of Songze jade plaques has the characteristics of those of Xia jades( two-directional drilling with polishing on both sides) and those of Qijia jades (one-directional drilling with polishing on one side and leaving the other side unpolished )
中國長江下游地區的新石器文化。因上海青浦崧澤遺址而得名。主要分佈在環太湖地區。該文化上承馬家浜文化，後繼是良渚文化，年代約公元前3800～前3300年。生產工具有穿孔石斧、扁石錛、條形石錛、石鑿、骨鏃、陶紡輪等；晚期出現石犁狀器。居民從事稻作農業，在陶器的羼和料中經常發現稻殻和稻草末。制陶工藝進步，用慢輪修整陶坯的技術已經普及。陶器有鼎、豆、壺、罐等，改採用的壓劃圖案、鏤孔和彩繪裝飾，十分醒目和美觀。流行各種玉石璜，當時作為項飾使用。崧泽文化是中国长江三角洲地区的新石器文化，崧泽文化的命名主要根据20世纪六七十年代的两次发掘的成果而于1979年定名。分布范围以太湖平原为中心，西起镇江一带，北达通扬运河，南至杭州湾北岸。年代为公元前4000至前3200年左右。在遗址发现有水井遗迹，崧泽文化早期玉器基本延续了马家浜文化晚期玉器的风格，所见器型仍较单调，以块、璜为主，但玉钺等突破装饰品范畴的新器形也偶有所见。崧泽文化的前身是马家浜文化，其后继者是良渚文化
