 Towards the north of Manila, other tektites and Paleolithic tools were excavated in impressive quantities.Although none of these were found in Manila proper (tektites were found in Quezon City, Rizal, and Bulacan), these findings still indicates the intense human activity in a very early period.Though there is a certainty that early humans could have ventured into the delta of Pasig River to search for food, there are still no traces of this appearance.