Citation Hunt

The Wikipedia snippet below is not backed by a reliable source. Can you find one?

Click I got this! to go to Wikipedia and fix the snippet, or Next! to see another one. Good luck!

In page Ixtlán del Rio (archaeological site):

"

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 the south, roughly dating to the period between 300 BCE and 400 CE, although there are disagreements 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.[3] The first major undisturbed shaft tomb associated with the tradition was not discovered but until 1993, at Huitzilapa, Jalisco.[4]