El Cóporo (Ocampo)
El Cóporo · El Coporo · Cóporo · Ocampo Guanajuato mound
Epiclassic (c.500–900 CE); Classic 500–650 CE, Epiclassic fortified 700–900 CE·Northern frontier Chalchihuites–Tunal–Bajío (Mesoamerican northern periphery; Chichimec interaction)·🇲🇽 Guanajuato State, Ocampo Municipality, Sierra de Santa Bárbara, Mexico
About
About El Cóporo (Ocampo)
Northern frontier hilltop ceremonial centre (c.500–900 CE) on Sierra de Santa Bárbara mesa — Chalchihuites–Tunal outpost contemporary with La Quemada but 400 km southeast: excavated by INAH (C. Castañeda 2010–) revealing terraced pyramid (Cóporo Pyramid) 10 m high, ballcourt turned ritual platform, adobe residential terraces, copper bells with West Mexican link, and rock art. Part of Bajío frontier buffering Chichimec–Toltec boundary; stratigraphy shows Classic florescence (500–600 CE) pirating Teotihuacan collapse refugees, then Epiclassic fortification (700–900 CE) before 900 CE abandonment synchronising Chalchihuites fall. Buried adobe terraces under pine-colluvium.
Why it mattersMost intact Bajío northern frontier terrace centre documenting Teotihuacan-collapse diaspora to northern frontier and 900 CE synchronized collapse.
Open questions
Mysteries & theories
Mysteries
- 01Cóporo–Chalchihuites link — colony or independent Bajío?
- 02Why mesa defensive — Chichimec raiding already 700 CE?
Theories
- 01Braniff Bajío frontier as Toltec Chichimec buffer model
- 02Castañeda northern frontier pilgrimage network via traders vs migrants debate
Theories are interpretations, not findings. The seal above tells you how much scholarly weight the place carries.
History
How it came to be
- Built
- c.500 CE Classic terrace village; Pyramid 600 CE; fortified Epiclassic 750 CE
- Period
- Epiclassic (c.500–900 CE); Classic 500–650 CE, Epiclassic fortified 700–900 CE
- Culture
- Northern frontier Chalchihuites–Tunal–Bajío (Mesoamerican northern periphery; Chichimec interaction)
- Builders
- Northern frontier Chalchihuites–Tunal–Bajío (Mesoamerican northern periphery; Chichimec interaction) builders
- Purpose
- Sierra mesa ceremonial-residential centre buffering Bajío agricultural frontier vs Chichimec steppe
- Abandoned
- c.900–950 CE northern frontier collapse (parallel Alta Vista–La Quemada) before Toltec Tula
- Rediscovered
- Excavated 2004–present C. Castañeda (INAH Guanajuato) El Cóporo Project
- Excavation
- Partially excavated
2000
Initial work at El Cóporo (Ocampo)
2015
Stratigraphy and geophysics synthesis for El Cóporo (Ocampo)
On the ground
Structures & features
21.0630° N · 101.3450° E · 2300 m · 3 mapped features
Cóporo Pyramid
pyramidMesa-top adobe pyramid with plaster
21.0632° N · 101.3452° EBallcourt/terrace
ballcourtCeremonial ballcourt platform
21.0628° N · 101.3448° EResidential terraces
settlementAdobe house terraces on mesa slope
21.0630° N · 101.3450° E