James K. Feathers

Paleoindian Cave Dwellers in the Amazon: The Peopling of the Americas

A Paleoindian campsite has been uncovered in stratified prehistoric deposits in Caverna da Pedra Pintada at Monte Alegre in the Brazilian Amazon. Fifty-six radiocarbon dates on carbonized plant remains and 13 luminescence dates on lithics and sediment indicate a late Pleistocene age contemporary with North American Paleoindians. Paintings, triangular bifacial spear points, and other tools in the cave document a culture distinct from North American cultures. Carbonized tree fruits and wood and faunal remains reveal a broad-spectrum economy of humid tropical forest and riverine foraging. The existence of this and related cultures east of the Andes changes understanding of the migrations and ecological adaptations of early foragers.

Effects of Temper on Strength of Ceramics: Response to Bronitsky and Hamer

Results of strength tests on sandand shell-tempered ceramics reported by Bronitsky and Hamer (1986) are difficult to interpret because of flawed experimental procedures and have questionable relevance to the archaeological record. Results from an improved procedure suggest shell-tempered ceramics as produced in prehistoric southeastern Missouri were stronger and tougher than sand-tempered counterparts.

Use of luminescence dating in archaeology

With improvements in methodology and instrumentation, luminescence dating is becoming a much more useful chronometric tool in archaeology. Procedures for dating ceramics are relatively routine and their accuracy has been demonstrated in a number of studies. Research is aimed at applying ceramic dating in situations where other methods lack the direct dating ability of luminescence to resolve chronological problems. Sediment dating is more difficult because of uncertainty in the extent of zeroing or because of mixtures of different aged deposits. These problems have been addressed by isolating signals most likely to be zeroed and by dating single aliquots, and ultimately single grains. Single-grain dating now has the potential not only to identify and date mixed deposits but to provide valuable information on site formation processes. This is particularly critical for judging site integrity at controversial sites.

Watson Brake, a Middle Archaic mound complex in northeast Louisiana

Middle Archaic earthen mound complexes in the lower Mississippi valley are remote antecedents of the famous but much younger Poverty Point earthworks. Watson Brake is the largest and most complex of these early mound sites. Very extensive coring and stratigraphic studies, aided by 25 radiocarbon dates and six luminescence dates, show that minor earthworks were begun here at ca. 3500 B.C. in association with an oval arrangement of burned rock middens at the edge of a stream terrace. The full extent of the first earthworks is not yet known. Substantial moundraising began ca. 3350 B.C. and continued in stages until some time after 3000 B.C. when the site was abandoned. All 11 mounds and their connecting ridges were occupied between building bursts. Soils formed on some of these temporary surfaces, while lithics, fire-cracked rock, and fired clay/loam objects became scattered throughout the mound fills. Faunal and floral remains from a basal midden indicate all-season occupation, supported by broad-spectrum foraging centered on nuts, fish, and deer. All the overlying fills are so acidic that organics have not survived. The area enclosed by the mounds was kept clean of debris, suggesting its use as ritual space. The reasons why such elaborate activities first occurred here remain elusive. However, some building bursts covary with very well-documented increases in El Niño/Southern Oscillation events. During such rapid increases in ENSO frequencies, rainfall becomes extremely erratic and unpredictable. It may be that early moundraising was a communal response to new stresses of droughts and flooding that created a suddenly more unpredictable food base.

Single-grain OSL dating of sediments from the Southern High Plains, USA

Single-grain OSL dating is applied to sediments from different depositional settings on the Southern High Plains of western Texas and eastern New Mexico. Criteria of acceptance are used to screen equivalent doses from individual grains and resulting distributions are evaluated in terms of normality. Wide variation is found in proportion of acceptable grains and in the distributions. While some of the latter are normal, many show broadening that may be the result of mixing of different-aged grains and skewness that may result from variant depositional and post-depositional modes. Geological modeling will be required to understand better these distributions, although for most samples means produced ages that agree with independent evidence. The resolution possible with single grains is necessary for best estimates of equivalent dose for other samples. A few samples do not agree with independent evidence, even with a normal distribution of equivalent dose. Sand dunes seem the most difficult to date accurately, probably because of mixing.

The application of luminescence dating in American archaeology

Luminescence dating is underutilized in American archaeology given the theoretical advantages of direct dating that it confers. Recent advances in understanding the physical processes underlying the method have also made it more reliable as a dating tool. This research as well as potential applications is reviewed.

Luminescence dating in archaeology, anthropology and geoarchaeology: an overview

Introduction.- Luminescence Dating Protocols and Dating Range.- Dose Rate.- Luminescence Dating of Archaeological Materials.- Luminescence-Based Authenticity Testing.- Luminescence Dating in Geomorphological and Geoarchaeological Research in Europe: Application Examples.- Meteoritic Impacts, Tsunamis.- Conclusions.

Precolumbian Settlements on Carriacou, West Indies

Abstract The first systematic archaeological investigation of Precolumbian sites on the island of Carriacou in the West Indies provides a rich source of information regarding Amerindian settlement in the southern Caribbean. Herein, we report results from an island-wide survey and subsequent excavation at two large village sites—Grand Bay and Sabazan—that provide evidence for an intensive late Ceramic Age occupation dating between CAL. A.D. 400–1200. Results from four seasons of excavation at Grand Bay and two at Sabazan indicate that inhabitants colonized the island later than larger nearby islands (although an earlier settlement is possible); were engaged in inter-island and South American interactions as evidenced through analysis of pottery, stylistic artifacts, and faunal remains; exploited a variety of marine and terrestrial foods, including several animals rarely found in the Antilles that were translocated to the island from elsewhere; and buried their dead in and around shell middens and, at least once, under a habitable structure.

Problems of Ceramic Chronology in the Southeast: Does Shell-Tempered Pottery Appear Earlier than We Think?

The chronology of shell-tempered pottery in the eastern United States is poorly understood, preventing any resolution to the question of how this pottery came to dominate ceramic assemblages in the late prehistoric period. Part of the problem lies in traditional dating methods that either provide only average dates that suppress variation or address depositional rather than manufacturing events. Better resolution can be obtained by dating individual artifacts. Luminescence dates for 67 ceramics from several sites in the mid-South show variation in age of ceramics from a single assemblage, strong chronological overlap between shell- and grog-tempered pottery, and suggest that shell-tempered pottery may have been present in low frequencies earlier than generally assumed and before it rose in frequency sometime after A.D. 900.

Luminescence dating and modern human origins

For the most recent evolutionary history of our species, that covering the emergence of anatomically modern humans during the last 100,000 years or more, few dating methods have such a wide range of potential application as luminescence dating. With its ability to provide direct ages in this time range for both archeological and depositional events, and using commonly occurring materials, luminescence seems to be an appropriate tool for almost any location containing modern or near‐modern human fossils or artifacts. However, the method is complicated and expensive, depending on variables that may be difficult to estimate in any given situation. This has deterred widespread use, although recent methodological developments have increased accuracy and reliability. An understanding of the potential and limitations of luminescence dating should help students of human origins judge its value and evaluate its applications.