What we do know about Teotihuacán chronology is that beginning 150-100 B.C. Teotihuacan grew rapidly due to regional dominance with those of Cuicuilio and relocation of much of the population. Many settlements moved from the hinterlands to the valley floor. Teotihuacán’s urbanism grew exponentially during the subsequent Patalachique Phase. This is also where we see the Moon Pyramid being constructed, which is one of the earliest public structures in the city that still stands today. The following listed chronology is the development and decline of Teotihuacán that is divided into six phases. This is based on ceramic distinctions defined through test excavations throughout the city.