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In page Ixtlán del Rio (archaeological site):

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This stage of prehispanic development distinguishes and identifies western Mexico from other mesoamerican cultural expressions, during the late formative period and early classical. The Nayarit shaft tomb complexes are identified within the early Ixtlán period (300 BCE to 300 CE), and three distinctive clay modeling styles have been defined: Chimisco, Ixtlán and San Sebastian.[1]