The Lowland Maya region has seen an enormous increase of new data over the last decade, but our progress is hampered by a tendency for cyclic return to previous theoretical positions. This results from several factors: too short a view of the discipline's history; a lack of familiarity with the rest of Mesoamerica; a lack of collaboration among archaeologists, ethnohistorians, and epigraphers; and a tendency to view alternative methodologies as competing rather than complementary. This paper synthesizes some of the major new discoveries and suggests where progress might be made if differing approaches were used in concert rather than in isolation.

A common procedure in paleodemography is to use mean skeletal age to estimate the expectation of life at birth in a population. This paper shows that skeletal age and expectation of life at birth are not equivalent unless the population is stationary. This assumption is not justified for most real populations. We show that mean skeletal age is approximately equivalent to the reciprocal of the birth rate and is not correlated with the death rate. Thus, the practice of inferring changes in life span and death rates from changes in mean age at death is not reliable and most conclusions of paleodemographic studies should be revised. On the other hand, skeletal age may provide high-quality information about fertility in archaeological populations. Several published paleodemographic studies are reinterpreted in light of the model presented.

Samples of microdrills, microblades, and microcores from the Powell Mound (11-Ms-46) and the Dunham tract (11-S-34/4) of the Cahokia site near St. Louis, and a small number of Jaketown perforators from the Poverty Point site, Louisiana, were examined for microwear traces, using the methods outlined by L. H. Keeley. Many archaeologists have assumed that the microdrills in the Cahokia microlithic industry were used by craft specialists to produce drilled disc beads and other items made from marine and freshwater shell. Microwear analysis of the Cahokia microdrills showed they were specialized tools, used almost exclusively to drill shell material, while the Jaketown perforators were used to drill a variety of materials. This alone does not establish the existence of craft specialization at Cahokia. The distribution of microdrills and shell artifacts at Cahokia and throughout the Cahokia settlement system on the American Bottom indicates shell craft production was not restricted to “guild areas.” The shell beads produced by the microdrills may have served as ritual tokens or currency as well as ornaments, but they were not necessarily produced by full-time specialists who were part of a state-level society.

Recent archaeological work at Colha and at other localities in the geographically restricted chert-bearing zone of northern Belize has revealed large-scale exploitation of chert for stone tool production. Workshops dated during the Late Preclassic period signal the beginning of craft specialization in chert working that continued in the Late Classic and into the Early Postclassic periods. Secular items such as large oval bifaces, tranchet bit tools and prismatic blades, as well as nonsecular eccentrics and stemmed macroblade artifacts are distinctive of the Late Preclassic and Late Classic workshops. The distribution sphere of Preclassic and Classic period chert tools has been traced to several contemporaneous sites that lie beyond the chert-bearing zone to the north. Colha has been identified as the primary production and distribution center during the Late Preclassic period; although it remained a production center in the Late Classic period, the main center for distribution may have shifted to Altun Ha.

The obsidian hydration dating technique has been refined since its invention in 1960. The hydration process slows down as it proceeds and appears to follow the relation: hydration thickness is proportional to the square root of time. The variables that influence the hydration rate are mainly the temperature experienced by the object to be dated and its chemical composition.

Methods of estimating effective integrated field temperatures and composition variables of obsidians are discussed.

Refinements and extensions to the permutation test for assessing the intrasite patterning of artifact distributions in an archaeological space are presented. Specifically, a Pearson type III distribution is employed to approximate the sampling distribution of the test statistic, an improved weighting is introduced to increase the efficiency of the test, and a method is presented to permit the inclusion of unclassified artifacts in the spatial analysis.

Time lapse studies of frost action effects on arctic and subarctic surficial archaeological sites have been conducted from 1973 to the present. Test plots of experimentally produced flakes were constructed in 1973 in the Tangle Lakes Region of the Central Alaska Range and subsequently remapped and photographed in 1974, 1976, and 1980. Similar test plots were laid out in the arctic foothills province of the Brooks Range. Observations made during the study period include: (1) flake displacements of as much as 20 cm/yr; (2) average minimum movement is 4 cm/yr; and (3) upslope movements were observed, suggesting that slope is not the primary factor in flake displacements. Frost heave, needle ice and, possibly, wind appear to be the dominant forces responsible for dispersals. It is argued that these and other natural processes can restructure the archaeological record into patterns that easily can be mistaken for those produced by human activity.

A method of using the Mesoamerican pecked cross as a 365-day or 365 1/4-day calendrical device is proposed. The method consists of placing, removing, and discarding objects in the pecked holes of the arms of the motif in a prescribed sequence. This use does not preclude other uses or meanings of these figures, nor their function in calendrical reckonings more complex than the solar year.

Cucurbits were recovered at archaeological sites from three geographical areas: (1) Coastal Peru, (2) the Andean Highlands, and (3) the Andean region of Northern Argentina. Analysis indicates that cucurbits were cultivated in the Coastal Plain of Peru as long ago as 4000–3000 B.C., perhaps longer. Lagenaria siceraria (Mol.) Standl., Cucurbita moschata, Duch. ex Poir, and the perennial squash, C. ficifolia Bouche were among the first cultigens. At a later date C. maxima Duch. is recorded from this area. It is probable that C. moschata and C. ficifolia reached the area from Central America or Mexico. Two sites excavated in the Andean Highlands yielded only limited amounts of cucurbit material, probably because the plants are not adapted to high altitude culture. Only rinds of L. siceraria and a species of Cucurbita were present. Exploration of archaeological sites in Northern Argentina is just commencing as far as cultivated plant materials are concerned, and little has yet been published. My identification of plant materials from excavations in Northern Argentina indicates an abundance of well-preserved C. maxima and L. siceraria.

Hieroglyphic and comparative linguistic evidence indicate that a Lowland Maya stela cult had been in existence, with monuments being erected predominantly or exclusively at the end of the 360-day year, in Late Preclassic times. These data corroborate Hammond's (1982) evidence for Late Preclassic stela erection. With his demonstration that the stela cult was associated with public architecture and a sacrificial burial at Cuello, the inference that contemporaneous stelae were erected primarily at year-endings establishes the complete Lowland Maya form of the stela cult well before the end of the Late Preclassic. It indicates that the cult was contemporaneous with Pacific coastal and adjacent highland stela cults, and developed at least partially in independence of the latter.

Archaeologists recently have been focusing increased attention on Native American concerns and archaeology. However, some serious issues of Native American attitudes toward the activities of archaeology have so far been overlooked. For example, in the San Juan Basin of northwestern New Mexico, archaeological activities that have been spurred by energy development violate certain tenets of the Navajo Way of living, with possible adverse effects. Suggestions for the mitigation of these effects are presented as a way of expanding the dialogue between archaeologists and Native American communities, in order to identify and resolve such ethical dilemmas.

A review of the obsidian hydration rates proposed for California obsidian sources raises questions of both practical and theoretical nature about the use of obsidian dating. Obsidian hydration rates so far proposed (primarily but not exclusively by Jonathon Ericson) require careful evaluation and checking against empirical data; routine use of the preliminary rates ignores cautions raised by the investigators and can lead to inaccurate chronological determinations. Used with discrimination, however, obsidian dating does yield chronological ages in which there can be a reasonable degree of confidence.

Contrary to Weaver's conclusion, no trend in either nutritionally related or infection-related pathologies can be demonstrated in skeletons from different time periods at Casas Grandes.

The results from an autecological study of the growth, reproduction, and population dynamics of Brosimum alicastrum (ramón) in southern Mexico are applied to the controversy surrounding the use of this species in Maya subsistence practice. The frequent occurrence of B. alicastrum near ruins is explained by its competitive advantage on shallow limestone soils coupled with a continual input of bat-dispersed seed. Populations of the tree at Tikal are then compared with other naturally occurring populations as an example of how a detailed ecological analysis may furnish valuable insight into the historical use of a plant species. The Tikal populations are shown to be atypical in terms of phenology, productivity and breeding systems, suggesting that some form of artificial selection may have been practiced by the Maya.

Since carbonized seed species differ in buoyancy characteristics, and since certain conditions may cause carbonized seeds to become nonbuoyant, the use of both buoyant and nonbuoyant modern carbonized seed species as a recovery standard is suggested in order to provide a more representative measure of flotation device effectiveness. Recovery standards utilizing modern carbonized seeds should be viewed as probable, rather than absolute, determinations of flotation device recovery efficiency because the effectiveness of flotation systems can be significantly altered by subtle changes in technique.