 In the higher areas, Dr. H. Otley Beyer has uncovered present city evidences of Neolithic culture.To name a few, stone adzes had been found in the old provincial building in the province of Rizal, in Pasig.There were also a few rare shouldered adzes dated 2000 years BC, together with ‘Luzon Ridged Adze’ in the river valley of San Juan, the upper Novaliches and Marilao valleys.