In this article we report on the results of our attempts to locate and study shaft-and-chamber tombs in the Municipality of Puerto Vallarta on the southern (Jalisco) side of the Banderas Valley of coastal West Mexico and to place these tombs in the broader context of burial practices in this area during a time corresponding to the Late Preclassic and Early Classic of Mesoamerica. We located and studied nine sites where shaft-and-chamber tombs had reportedly been discovered and looted, but here we focus on three (El Reparito, El Pozo de Doña Amparo, and La Pedrera) where we were able to excavate un-looted as well as partially looted shaft-and-chamber tombs. In the process we obtained evidence of (1) the location and type of soil selected for the excavation of such tombs; (2) variation in the form and content of the shafts and tomb chambers; (3) the tools used for digging and the manner of sealing such tombs; (4) chronological placement of the tombs; (5) burial of infants, sub-adults, and adults in the chambers; (5) pathology in the pre-Hispanic population responsible for such tombs; (6) cremation of bodies and their curation for different periods of time before incineration; and (7) alternative forms of interment along with shaft-and-chamber tombs in the same cemetery. Also, the data obtained lend support for the idea that the Ameca River and the Banderas Valley formed a "soft frontier" at this time between fairly distinct pre-Hispanic cultural traditions found to the north and to the south of the river, an area in which there was some intermixing of these traditions.

Samples of marine shell from archeological context on the coast of Nayarit, Mexico, have given radiocarbon determinations of 1810 +/- 80 B.C., 2000 +/- 100 B.C., and 2100 +/- 100 B.C. Even with maximum correction for upwelling these are the earliest dates for coastal occupation in West Mexico north of Acapulco, Guerrero. Analysis of the midden contents has provided new insights regarding early coastal adaptation.

This article reports on the discovery of an unusual type of secondary burial found at two Middle Formative sites in the Mascota valley of Jalisco, West Mexico. We examine these burials within a Middle and Late Formative period context as well as a broader temporal context of funerary customs and mortuary programs involving secondary-type burials. Tightly wrapped, elaborately processed bundled burials were recovered at the cemeteries of El Embocadero II and Los Tanques. We report on the human remains from both sites and examine burial context and biological identity to seek explanations. The individuals selected for this burial treatment are not associated with any markers of high status. These burials may represent a different ethnic, familial, community or ancestral identity, and we consider the broader secondary burial phenomenon as the possible expression of a ritual of seasonal interment associated with the use of a mortuary hut to curate and process the bodies.

New data from two sites in the municipality of San Blas, Nayarit, indicate that the practice of pecking petroglyphs in West Mexico is older than it has been possible to establish in previous studies. Petroglyphs at the La Coba site appear firmly dated to the Los Cocos phase (A.D. 200-600), and petroglyphs at the El Conchal site seem attributable to the Early Ixtlan phase (300 B.C.-A.D. 200) occupation. Hypotheses are offered regarding stylistic evolution of the pecked designs and their interpretation.

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