Evaluating the Reliability of Fluoride Dating at Two Prehistoric Mound Sites in Mississippi

Abstract

Ion-selective electrode fluoride dating is used to address chronological problems at two mound sites located in Mississippi. At the Mississippian period (A.D. 900–1520) Lyon's Bluff site, 220K520, the fluoride content of deer and human bone is compared with radiocarbon dates and stratigraphic levels to evaluate the reliability of the fluoride dating method for understanding relative burial chronology. At a second site, Pocahontas Mound A (22HI500), fluoride content of deer bone is used to corroborate radiocarbon dates and to establish the proper chronology of levels associated with two distinct occupations (Archaic and Coles Creek/Plaquemine) identified in a large midden area. Fluoride analysis also is used to date a second midden area at this site. For Lyon's Bluff; fluoride dates did not correspond with accelerator mass spectrometry (AMS)-dated burials and midden strata. In contrast, fluoride dating proved very useful in determining chronological placement of midden levels and dating other areas at Pocahontas Mound A. Sample age, site location, soil, and bone preservation are considered as possible causes for the negative results at Lyon's Bluff.     

Archaeological Site or Natural Marine Community? Excavation of a Submerged Shell Mound in Ninigret Pond,Rhode Island

ABSTRACT

Submerged shell midden sites and natural shell deposits can have similar characteristics and can be difficult to distinguish archaeologically. We excavated two test units from a large (at least 35 m×70 m) submerged shell mound in Fort Neck Cove in southern Rhode Island to assess whether it was natural or cultural in origin. This mound had been recognized as a potential archaeological feature as early as the 1970s. Excavation, radiocarbon dating, and subsequent laboratory analysis of excavated materials suggest that the mound was a natural oyster reef rather than a submerged archaeological site. No artifacts were found; there was no clear evidence for human modification of any shells; small species that would not have been targeted as food were present; and δ¹³C values of oyster shells from the mound were consistent with freshwater input into their growth environment, suggesting that they grew in an estuarine environment that did not exist prior to the inundation of the ponds. The stratigraphically oldest radiocarbon date we could obtain (430–190 cal BP, 2σ range), from 70 cm below the pond floor, placed deposition of shells at least 3,000 years after the inundation of the pond. The excavation methods that we used and the process of testing, irrespective of whether the feature is cultural, are valuable contributions to the methodological literature on submerged site archaeology and help provide insight for other researchers working to discern natural from cultural shell midden sites.     

OYSTER DEMOGRAPHICS AND THE CREATION OF COASTAL MONUMENTS AT ROBERTS ISLAND MOUND COMPLEX,FLORIDA

Abstract

Anthropogenic coastal landscapes often incorporate shell, a durable remnant of subsistence activity. Collection, consumption, and even feasting can thus contribute to histories of site formation and mound construction. This research assesses how oyster consumption related to the creation of Mound A, a shell mound at the Roberts Island Shell Mound Complex in Citrus County, Florida, is differentiated from the instances of oyster consumption that resulted in the midden constituting the rest of the island. I compare the size of shell remains from mound and off-mound midden contexts to assess variation in the sizes represented across the samples, stratigraphic variation within each context, and evidence for directional change indicative of over-exploitation. I identify a relationship of dependence between shell size and stratigraphic depth in off-mound samples that does not appear in mound samples, suggesting a relatively short period of time for the accumulation of mound deposit oyster shells. The findings of this study point to mound construction at Roberts Island Shell Mound Complex as a distinct and deliberate activity, with the construction event likely sharing importance with the community aggregation and consumption that facilitated it.     

CHRONOLOGY,SITE FORMATION,AND THE WOODLAND-MISSISSIPPIAN TRANSITION AT BAYSHORE HOMES,FLORIDA

Bayshore Homes (8PI41) is a large mound and midden complex on Florida’s west-central Gulf Coast that was investigated originally by William Sears in the 1950s. From 1999 to 2009, the authors conducted survey, test excavations, and soil coring to address questions regarding site formation, chronology, and cultural affiliation. Radiocarbon dates and ceramic analysis indicate two separate occupations during the Woodland and Mississippi periods, cal. A.D. 140–565 and cal. A.D. 890–1390 (2 sigma). The earlier occupation is associated with the Manasota archaeological culture, sand-tempered plain pottery, burials in midden deposits, and interments in a sand mound accompanied by Weeden Island–related mortuary ceramics. The later occupation is associated with Weeden Island–related decorated and Pinellas Plain ceramics in midden deposits and represents the transition from terminal Weeden Island to the Englewood phase of Early Safety Harbor. A large burial mound and a platform mound are associated with this period of site use. Our results also indicate that the unusual ceramic sequence identified by Sears in the site’s large shoreline shell midden is the result of redeposition, which occurred sometime after cal. A.D. 1220. Possible explanations for the redeposition event include monumental mound construction or the elevation of the midden ridge to serve as a foundation for structures to protect them from rising sea levels or storm surges.     

EARLY WOODLAND SETTLEMENT AND MOUND BUILDING IN THE UPPER TENSAS BASIN,NORTHEAST LOUISIANA

Abstract

Traditionally overlooked because it lacks hallmarks of material and cultural complexity, Early Woodland in the Southeast is an interval of significant transformation in material culture, settlement, and social organization. Investigations at four sites in northeast Louisiana provide insights into changes taking place at this time. These sites are situated on a crevasse splay created by flooding at the end of the Archaic. This flooding is associated with an occupation hiatus ca. 3000–2500 cal B.P. Evidence suggests a rapid colonization of the crevasse splay by people using Tchefuncte pottery, and there is no evidence at these sites of stratigraphic or cultural continuity from Poverty Point. The Early Woodland occupation in the study area dates ca. 2400–2100 cal B.P., which is later than dates associated with Early Woodland in the Pontchartrain Basin and contemporary with Lake Cormorant culture sites farther north. Early Woodland in northeast Louisiana is marked by a diagnostic Tchefuncte ceramic assemblage and the presence of a settlement system composed of small villages or hamlets nucleated around a conical mound that presumably served as a ceremonial/ritual center. This mound was erected very rapidly; radiocarbon dates suggest it was constructed in no more than 10 years. Although mound building has been suspected, this is the first conclusive evidence it was an aspect of Tchefuncte settlement and ceremonial practices. Data from these sites bear on the question of cultural and demographic continuity and change at the Archaic to Woodland transition. Previous models emphasize continuity of populations with ceramic technology and styles diffusing into the lower Mississippi Valley. In contrast, our data support a model of Early Woodland repopulation of the lower Mississippi Valley from the south and east following a prolonged period of regional abandonment.     

DENTAL ATTRITION AT THE INDIAN KNOLL (15OH2) AND BLACK EARTH (11SA87) SITES: EXTREME WEAR AS A STRESSOR IN LATE ARCHAIC POPULATIONS OF THE OHIO VALLEY

Abstract

This study investigates comparatively the prospect that excessive dental wear in certain Late Archaic populations in eastern North America was caused by extensive shellfish consumption and the associated ingestion of grit. Specifically, the amount and rate of dental wear at Indian Knoll, a large shell midden site in western Kentucky, are compared to those at the Black Earth site, a contemporary occupation in southern Illinois with no evidence of shellfish utilization. Results show no significant differences in dental wear between Indian Knoll and Black Earth and point correspondingly toward the alternative prospect that the intensification of Late Archaic food-processing technology using stone-grinding and hot-rock cooking was the proximate cause. Such technologies provided short-term caloric benefits, but long-term disease consequences for adults of child-bearing age. A decrease in young adult dental wear correlates with the adoption of both food production and pottery in the subsequent Woodland period.     

THE 1974–75 EXCAVATIONS AT MOUND BOTTOM,A PALISADED MISSISSIPPIAN CENTER IN CHEATHAM COUNTY,TENNESSEE

Abstract

Mound Bottom (40CH8) is a large complex of 14 prehistoric mounds located in a horseshoe-shaped bend of the Harpeth River, a tributary of the Cumberland, in Cheatham County, Tennessee. It, together with another mound group 3 km to the south known as the Pack site (40CH1), received sporadic archaeological attention during the first half of the twentieth century, but it was not until 1974 that systematic work was carried out at either mound center. Over portions of that and the following year, Mound Bottom was mapped in detail and excavations were carried out to document the range in variability of mound construction and community structure. Six mounds were tested and 19 houses were partially or totally excavated. House types included both single-set-post structures and wall-trench structures. Calibrated radiocarbon dates from Mound Bottom span about a 600-year period from the eighth through the fourteenth centuries.     

The Case of the Caldwell Mound: A Woodland Period Mound in the Central Scioto River Valley

ABSTRACT

This article presents a reconstruction and analysis of the Caldwell Mound located in the central Scioto River valley of southern Ohio. The mound contained a log tomb, at least four burials, and associated funerary objects. Four AMS radiocarbon dates place the Caldwell Mound within the last century BC and first century AD, and the mound contains evidence of practices historically associated with “Adena” and “Hopewell.” Few other records exist from this period in the region despite it experiencing perhaps some of the most dramatic socioreligious transformations in precolumbian North America. This analysis documents early evidence for the diversification and segregation of leadership roles based on the interpretation of three buried individuals. It also demonstrates the utility and efficacy of working with amateur-produced records and collections, even when incomplete, to reconstruct and glean insight from important Woodland period sites.     

Exploring Oyster (Crassostrea virginica) Habitat Collection via Oxygen Isotope Geochemistry and its Implications for Ritual and Mound Construction at Crystal River and Roberts Island,Florida

Research at Crystal River and Roberts Island Shell Mound Complex, on the western coast of Florida, USA, offers a quantitative assessment of the temporality of shell deposit construction, Native subsistence practices, and mobility patterns through stable oxygen isotope data from eastern oyster (C. virginica). The δ¹⁸O_water values of oysters vary synchronously with salinity, assuming relatively constant δ¹⁸O_water/salinity gradients since the time of occupation, allowing for an examination of shifts in oyster habitat exploitation over time. Our previous (Thompson et al. 2015) study indicated that midden accumulation occurred throughout the year, while oysters from mound deposits were collected in colder months. New data indicate that in addition to differential season of collection, habitat exploitation also varied. During early occupation at the site, oysters were collected primarily from lower saline habitats, while in later phases oysters were obtained from higher salinity waters; we relate this to a lower sea level and concomitant settlement shift seaward. Additionally, oyster from later mound contexts was collected from higher saline habitats relative to those in midden contexts; Native people may have targeted specific bioherms at certain times for the year for feasting-related mound construction.     

Dating Ancient Burial Mounds in Denmark – Revealing Problematic Ancient Charcoal

The National Museum of Denmark and the Department of Geography at the University of Copenhagen have collaborated on a project investigating burial mounds near early Medieval churches. The aim was to identify a possible continuity in cult sites across the shift to Christianity in the late Viking Age. Charcoal samples from 18 mounds were radiocarbon dated but the results showed they were far older than expected. Control dating undertaken on burial mounds of known age confirmed that charcoal in the mound fill can at least be up to 3000 years older than the mound itself. As charcoal can survive in the surface soil layer for millennia, in spite of ploughing, bioturbation and frost, it may also dominate the charcoal pool of the grass or heather turfs used in the mound construction. Therefore, the article concludes, charcoal cannot be used to securely date archaeological features built with turfs and it is important to be aware of the possible presence of very old charcoal when selecting material for dating archaeological features, even those which otherwise would be judged unaffected by material from earlier archaeological periods.     

PASTE CHARACTERIZATION OF WEEDEN ISLAND POTTERY FROM KOLOMOKI AND ITS IMPLICATIONS FOR SPECIALIZED PRODUCTION

Abstract

We report the results of a petrographic analysis of pottery from Kolomoki, a Middle and Late Woodland period mound and village complex in southwestern Georgia. Thin sections of 65 sherds representing several prestige and utilitarian Weeden Island pottery types, from both domestic (midden) and ceremonial (mound) contexts, were obtained. For comparison, we also analyzed samples from a few potential clay sources. We characterize the range of variability in paste/resource groupings present in the Kolomoki assemblage and use these data to address patterns of manufacture and exchange of Weeden Island pottery through comparisons to thin sections of comparable types from the McKeithen site and other Weeden Island sites in the region.     

From the Piedmont to the Coast: LA-ICP-MS 87Sr/86Sr evidence for short-term,long-distance mobility in the American Southeast

Mounting evidence suggests that the Archaic Southeast shell mound builders had large-scale trade networks and engaged in social aggregations. Here, incremental ⁸⁷Sr/⁸⁶Sr values were measured by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) in third molar enamel samples of 11 individuals interred in the Middle Archaic Harris Creek shell burial mound in St. John's River Valley (SJRV), Florida. Results reveal that SJRV residents engaged in short-term, long-distance mobility up to the Piedmont margin and excursions into coastal areas, consistent with direct trading and social gatherings. Two individuals are interpreted as migrants from central Tennessee, suggesting a link to the Ohio River Valley shell mound builders.     

THE CHRONOLOGY OF MONKS MOUND

Abstract

Monks Mound is the largest single Native American construction in North America. The mound sits at the center of the Cahokia site, and interpretations of its construction and use are fundamental for understanding how Mississippian peoples created mounds and landscapes. In the past, researchers speculated that Monks Mound was both one of the oldest and longest-lived monuments at Cahokia. Using a Bayesian computer model that incorporates both archaeological information and radiocarbon dates, I argue the mound is younger and was built more rapidly than previously thought. The mound likely was built in two very rapid efforts spanning fewer than twenty years. This analysis shows Cahokian society could mobilize vast quantities of labor for short periods, which may have inhibited institutionalized, transgenerational sociopolitical hierarchies.     

Pre-Columbian Amerindian Lifeways at the Sabazan Site,Carriacou, West Indies

Recent excavations at the Ceramic Age village site of Sabazan on Carriacou, Grenada, indicate long-term occupation spanning AD 400 to 1400. One of the earliest settlements in the Grenadines Archipelago, Sabazan's chronology corroborates late Saladoid colonization of the region with the timing of major developments at this location supported by a robust chronology of 26 radiocarbon assays. Investigation of deep, stratified midden deposits yielded abundant ceramic, shell, and stone artifacts, faunal remains, and burial and domestic features. Zooarchaeological evidence indicates a heavy reliance on marine resources and a well-developed tuna (Scombridae, Thunnini) fishery. While data point to sustainable resource exploitation over a millennium, shifts in foraging strategies are evident, including declines in the fish catch and increasing reliance on large or easily acquired mollusks, particularly queen conch (Lobatus gigas) and nerites (Nerita spp.). These trends may be driven by the greater aridity and warmer sea surface temperatures of the Medieval Warm Period (ca AD 900–1300). Exotic artifacts and the remains of introduced mammals at Sabazan provide evidence for inter-island and continental interactions. Here, I synthesize these findings and their significance for reconstructing West Indian colonization, tracing exchange and interaction networks, and understanding human ecodynamics and long-term adaptation to small island ecosystems.     

Patterns of Interpersonal Violence at the Fisher Site

Abstract

Recent reanalysis of crania from the Late Prehistoric Fisher site in Will County, Illinois indicates relatively high levels of interpersonal violence. In the Big East and Big West mounds, cranial trauma was likely a result of repeated, low-level harassment of the villagers, resulting in the death of only a few people at a time. Numerous burials in the south-southwest mound, however, were interred in a large pit that reportedly contained at least 40 partially disarticulated individuals. Of those individuals from the mass burial pit, nearly all of the crania available for study showed evidence of perimortem trauma. These victims were likely the result of a large-scale attack that resulted in numerous deaths and subsequent abandonment of the site. Accelerator mass spectrometry (AMS) of radiocarbon dates indicate that this violence was occurring between about A.D. 1225 and 1300, a period that seems to have been a particularly volatile one in Late Prehistoric Illinois.     

TOWARD A NEW VIEW OF HISTORY AND PROCESS AT CRYSTAL RIVER (8CI1)

Abstract

The Crystal River site (8CI1), located on Florida’s westcentral Gulf Coast, has long been counted among the most impressive yet inscrutable archaeological sites in the eastern United States. Excavations by C. B. Moore in the early twentieth century produced a number of artifacts with apparent Hopewellian affiliations, thus indicating an occupation during the Middle Woodland period. However, other features of the site—particularly the presence of flat-topped mounds and negative-painted pottery—suggested a later (Mississippian) date. This apparent conflict cast a cloud of confusion over the site, exacerbated by the later discovery of three purported limestone stelae. We present new insights into Crystal River based partly on new field work, including detailed topographic mapping, geophysical survey, and limited small-diameter coring. These field investigations, when combined with radiocarbon dates and the data gleaned from previous investigations, allow us to make new inferences regarding the chronology of settlement and mound construction at Crystal River. Specifically, we posit, based on these data, a greater degree of planning, structure, and complexity to the site from its founding, possibly as early as cal. 300 B.C. Further, these early practices impact the overarching historical trajectory of the site, guiding subsequent practices over a long time span, likely as late as cal A.D. 600.     

Formal analyses and functional accounts of groundstone “plummets” from Poverty Point, Louisiana

Groundstone plummets of magnetite or hematite are commonly found artifacts of the Late Archaic period in Louisiana. While often assumed to have functioned as weights for fishnets or as thrown objects used to catch waterfowl, relatively little empirical evidence has been generated to explain their form and features relative to hypothesized performance in prehistoric behavior. To address this deficiency, we provide a morphometric analysis of the variability in plummet shape as a means for studying the performance constraints inherent to their use. Based on our analyses, we find that plummet form is well explained as a component of weighted looms, supporting the early use weaving technology in the Late Archaic of Eastern North America.     

The earliest evidence of domesticated wheat in the Crimea at Chalcolithic Ardych-Burun

Abstract

This paper reports the discovery of the earliest evidence of domesticated wheat in the Crimean peninsula from the Ardych-Burun shell midden site, Ukraine. The Ardych-Burun site dates to middle of the 4th millennium cal b.c. For the first time, the chronology of a Ukrainian Chalcolithic period site has been established through direct radiocarbon dating of cereal grains retrieved from it. This discovery allows for a wider discussion of the chronology and geographical origins of domesticated plant species in Ukraine and the role the Caucasian corridor may have played in the spread of agriculture into eastern Europe. The presence of cereal crops in the southern Crimea enriches our understanding of the subsistence strategies of the coastal population, which was previously linked only with pastoralism, hunting, and the exploitation of marine resources.     

DETERMINING THE SEASON OF MISSISSIPPIAN HOUSE CONSTRUCTION FROM PLANT IMPRESSIONS IN DAUB

Abstract

It has been suggested that Mississippian farmsteads in some parts of the Southeast were abandoned in the late fall/early winter, with concomitant population concentration in large, palisaded villages. This assertion is contradicted by published data on plant impressions in daub which indicate farmstead house construction during the fall. Missing from this debate has been information on the season of house construction at mound centers. Plant impressions in daub from a structure at the Lyon’s Bluff site (22OK520) in Mississippi indicate that house construction took place during early to midspring. When coupled with other data, year-round construction at this mound and village complex is suggested. Although these results do not solve the question of the season of house construction at farmsteads, they do suggest that house construction at mound sites was not confined to any particular season of the year, as might be expected with seasonal influxes of farmstead inhabitants.     

A palynological and geoarchaeological investigation into Bronze Age farming at Belderg Beg,Co. Mayo,Ireland

This contribution describes the results and interpretations of geoarchaeological and palynological analyses of a soil profile near to a ¹⁴C dated Bronze Age roundhouse in a sub-peat field system at Belderg Beg, north Mayo in western Ireland, which displayed field-scale evidence of tillage in the form of cultivation ridges. This evidence of arable cultivation was supported by the presence of quernstones in the roundhouse, but there was no supporting evidence from other forms of socio-economic analysis. Soil micromorphological analysis was employed to define how the ridges were created and with what tools; pollen analysis was used to characterise the surface vegetation and test the purpose of the ridges. The results unequivocally showed that a phase of ard cultivation was followed after a brief hiatus by ridge-and-furrow tillage. There were tentative indications of possible amendment of the earlier, ard-worked soil, and more definitive evidence of midden material addition to the ridged soil. An AMS radiocarbon assay on the base of peat overlying the ridges indicated that tillage occurred in the Mid to Late Bronze Age.