Philippine Pre-Historic Influences Philippine Prehistory covers the events prior to the written history of what would become the Philippine archipelago. The current demarcation line between this period and the early history of the Philippines is 900 AD, which is the date of the first surviving written record to come from the Philippines, the Laguna Copperplate Inscription. This period saw the immense change that took hold of the archipelago from Stone Age cultures in the 4th century, continuing on with the gradual widening of trade until 900 and the first surviving written records. Stone-Age (c. 50,000 - c. 500 BC) The first evidence of the systematic use of Stone-Age technologies in the Philippines is estimated to have dated back to about 50,000 BC, and this phase in the development of proto- Philippine societies is considered to end with the rise of metal tools in about 500 BC, although stone tools continued to be used past that date. Filipino Anthropologist F. Landa Jocano refers to the earliest noticeable stage in the development of proto-Philippine societies as the Formative Phase. He also identified stone tool and ceramics making as the two core industries that defined the economic activity of the time, and which shaped the means by which early Filipinos adapted to their environment during this period. About 30,000 BC, the Negritos, who became the ancestors of today's Aetas, or Aboriginal Filipinos, descended from more northerly abodes in Central Asia passing through the Indian Subcontinent and reaching the Andamanese Islands. From thereon, the Negritos continued to venture on land bridges reaching Southeast Asia. While some of the Negritos settled in Malaysia, becoming what is now the Orang Asli people, several Negrito tribes continued on to the Philippines through Borneo. No evidence has survived which would indicate details of Ancient Filipino life such as their crops, color, and architecture. Philippine historian William Henry Scott points out any theory which describes such details is therefore a pure hypothesis and should be honestly presented as such.