 In most cases, the earliest burial jars used were large indigenous earthenware jars, followed by indigenous or imported stoneware jars ("martaban"), and finally imported porcelain jars acquired from the burgeoning maritime trade with China and Mainland Southeast Asia at around the 14th century CE.The ancestral pre-Austronesian Liangzhu culture (3400–2250 BCE) of the Yangtze River delta was one of the ancient centers of Neolithic jade carving.Jade was spread to Taiwan by around 3,000 BCE, then further into Vietnam at 2,000 BCE and the Philippines at 1,800–1,500 BCE.