Western Mexico shaft tomb tradition

The Western Mexico shaft tomb tradition or shaft tomb culture refers to a set of interlocked cultural traits found in the western Mexican states of Jalisco, Nayarit, and, to a lesser extent, Colima to its south, roughly dating to the period between 300 BCE and 400 CE, although there is not wide agreement on this end-date. Nearly all of the artifacts associated with this shaft tomb tradition have been discovered by looters and are without provenance, making dating problematic. The first major undisturbed shaft tomb associated with the tradition was not discovered until 1993, at Huitzilapa, Jalisco.

Originally regarded as of Purépecha origin, contemporary with the Aztecs, it became apparent in the middle of the 20th century, as a result of further research, that the artifacts and tombs were instead over 1000 years older. Until recently, the looted artifacts were all that was known of the people and culture or cultures that created the shaft tombs. So little was known, in fact, that a major 1998 exhibition highlighting these artifacts was subtitled: "Art and Archaeology of the Unknown Past".

It is now thought that, although shaft tombs are widely diffused across the area, the region was not a unified cultural area. Archaeologists, however, still struggle with identifying and naming the ancient western Mexico cultures of this period.

The shaft tomb tradition is thought to have developed around 300 BCE. Some shaft tombs predate the tradition by more than 1000 years – for example, the shaft tomb at El Opeño in Michoacán has been dated to 1500 BCE but is linked to Central, rather than Western, Mexico. Like much else concerning the tradition, its origins are not well understood, although the valleys around Tequila, Jalisco, which include the archaeological sites of Huitzilapa and Teuchitlan, constitute its "undisputed core". The tradition lasted until at least 300 CE although there is not wide agreement on the end date.

The Western Mexico shaft tombs are characterized by a vertical or nearly vertical shaft, dug 3 to 20 metres down into what is often underlying volcanic tuff. The base of the shaft opens into one or two (occasionally more) horizontal chambers, perhaps 4 by 4 metres (varying considerably), with a low ceiling. The shaft tombs were often associated with an overlying building.

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