Radiocarbon Chronometry of Site QJ-280, Quebrada Jaguay,a Terminal Pleistocene to Early Holocene Fishing Site in Southern Peru

Excavations in 1970, 1996, and 1999 at Site QJ-280, Quebrada Jaguay, in southern Peru, yielded enough dateable terrestrial plant material to establish an extensive radiocarbon chronology for the site. QJ-280 is one of oldest well-dated fishing sites in the Americas: it was occupied from the terminal Pleistocene to the mid-Holocene (about 13,000–8,300 calibrated years BP) based on 42 terrestrial radiocarbon dates, encompassing the Jaguay and Machas Phases of the local archaeological sequence. In addition to the terrestrial dates, radiocarbon measurements on valves of two marine surf clam (Mesodesma donacium) individuals from a single, well-dated mid-Holocene Manos Phase archaeological context have provided insight into marine upwelling conditions during the occupation of Quebrada Jaguay. The marine reservoir age varied between 130 and 730 ¹⁴C years during the brief lives of the two clams (up to 5 years each), and varied by up to 530 ¹⁴C years within an individual valve, suggesting strong and variable deep marine upwelling; conditions broadly similar to those that exist in coastal Peru today. These rapid variations in marine radiocarbon age suggest that marine radiocarbon dates from environments with variable upwelling could be skewed by up to hundreds of years.     

A Late Pleistocene Occupation on the Southern Coast of Oregon

Abstract

Geoarchaeological research on the southern coast of Oregon brought to light archaeological evidence of early human occupation in the late Pleistocene. Indian Sands (35CU67) lies on a highly eroded deflated headland on the Oregon coast where previous surveys had found and dated surficial cultural materials as early as 8250 b.p. (uncalibrated radiocarbon years). Prior to excavation of Indian Sands, sediment and stratigraphic analysis, along with radiocarbon and thermoluminescence dates, established the existence of late Pleistocene deposits. The excavations confirmed the presence of buried cultural deposits containing lithic artifacts, charcoal, and fire-cracked rock. Dispersed charcoal from the floor of an artifactbearing level was dated to 10,430 b.p., more than 2000 ^l4C years older than any other Oregon coastal site.     

A Short History of Archaeological Sieving at Franchthi Cave,Greece

Abstract

Excavations at the Franchthi Cave in SE Greece, under the direction of Dr. Thomas Jacobsen, have revealed a long habitation sequence of considerable interest to students of the early history of the Aegean Basin. The earliest recoverable deposits date to about 25,000 B.P. The most recent radiocarbon dates indicate that the latest deposits belong to the period around 3000 B.C.

The excavations themselves were carried out over the years 1967–1976. During that time, excavation techniques used at the site evolved considerably. Object recovery by various methods of archaeological sieving forms a major component of this evolution. The purpose of this article, therefore, is to discuss the standards of object recovery at Franchthi and the adaptation of sieves designed elsewhere to the situation at Franchthi, as well as to serve as a guide to other excavations planning a program of archaeological sieving.     

Recent Research on the Upper Palaeolithic Phase in India

Abstract

Recent discoveries of artifactual assemblages based on blade-tool technology, occurring in post-Middle Palaeolithic and pre-Mesolithic contexts in different parts of India, are filling the gap in the Indian Stone Age sequence. These lithic industries, along with the bone tools obtained from the Kurnool caves, the faunal associations at some sites, and the available radiocarbon dates, are now seen beyond doubt to represent the Upper Palaeolithic period.     

Early Neolithic Sites at Brześć Kujawski,Poland: Preliminary Report on the 1976–1979 Excavations

Abstract

Since 1976, excavations have been conducted on two neighboring Early Neolithic sites at Brze?? Kujawski, Wloclawek district, Poland. The aim of this research is to improve the understanding of the developmental sequence of Early Neolithic cultures on the Polish lowlands as well as to recover palaeobotanical and archaeozoological materials to study the changes in subsistence patterns over time. There are three components of Early Neolithic settlement at Brze?? Kujawski: the Linear Pottery, Early Lengyel, and Late Lengyel cultures, which span the period between 4300 and 3000 radiocarbon years B.C. Large amounts of animal bones indicate a shift from cattle-centered stockbreeding in the Linear Pottery component to a very diverse pattern of animal exploitation in the Late Lengyel component. Early Neolithic house remains, storage pits, flint industries, and copper artifacts are also discussed.     

BAYESIAN MODELING OF THE OCCUPATION SPAN OF THE AVERBUCH SITE IN THE MIDDLE CUMBERLAND DRAINAGE,TENNESSEE

Abstract

The application of Bayesian models to suites of radiocarbon dates can provide important refinements over standard approaches toward calibration and seriation of dated feature contexts. We have modeled a number of older radiocarbon dates submitted in the 1980s along with a recent set of accelerator mass spectrometry dates from the Averbuch site (40DV60), a Mississippian village in the Middle Cumberland Region of Tennessee occupied in the fourteenth and fifteenth centuries A.D. The results of these analyses demonstrate that even within its short lifespan of ca. 200 years, the village underwent fundamental organizational changes. These shifts appear to be responses to climatic deterioration and an upsurge in regional violence.     

Metal Working in the Northern Lowveld,South Africa A.D. 1000–1890

Abstract

The Iron Age archaeology of the northern Lowveld of South Africa is notable for the abundance of mining, metal working, and salt production sites recorded in the region. We report the results of scientific studies of the metallurgical remains recovered from 1965 to 1978 by Nikolaas J. van der Merwe, David Killick, and colleagues in various campaigns of survey and excavation in the Phalaborwa region, a major center of precolonial metallurgy. Both iron and copper ores occur in a carbonatite complex at Phalaborwa and were smelted in low-shaft furnaces of two different designs. Two radiocarbon dates of ca. 1000 b.p. are available for the mines themselves, which have now been completely destroyed. All other radiocarbon dates for the archaeological sequence at Phalaborwa fall in two groups, the first from the 10th to 13th centuries A.D., the second from the 17th through the 20th centuries A.D. Both iron and copper were smelted in both periods; tin-bronze and brass appeared towards the end of the earlier period.     

The Timing of Angel Mounds Palisade Construction A Search for the Best Chronological Model

Abstract

Angel Mounds was a heavily fortified Mississippian settlement with several discrete palisades. Although the palisades were identified early on, the construction sequence has remained elusive because the construction episodes do not have stratigraphic relationships with one another. Recent work at the site reexamined old test excavations and collected new material for radiocarbon dating. AMS dating yielded a suite of new dates from palisade contexts. To refine the construction sequence, five Bayesian chronological models were constructed for palisade building. These models indicate that palisades were first built at Angel Mounds sometime between A.D. 1278 and A.D. 1410, which precedes or coincides with regional depopulation in the lower Ohio River valley. These results further indicate that palisade building at Angel Mounds may be a consequence of external competition and conflict caused by resource-induced stress resulting from deteriorating climatic conditions.     

The Middle Holocene Shell Mound of El Gouna on the Red Sea (Egypt)

Abstract

In the El Gouna (Hurghada) area on the Red Sea of Egypt, a Middle Holocene shell mound from around 5800 B.P. (uncalibrated radiocarbon years before A.D. 1950) has been tested by a restricted excavation. Collection of shellfish on the Red Sea shore provided subsistence opportunities for Middle Holocene groups coeval with the Early Predynastic Tasian of the Nile Valley. The El Gouna site demonstrates for the first time that prehistoric shell mounds exist near the Egyptian Red Sea shore.     

New radiocarbon dating of the transition from the Middle to the Upper Paleolithic in Kebara Cave,Israel

The Middle to Upper Paleolithic transition (MP-UP transition) is considered a major technological and cultural threshold, at the time when modern humans spread “out of Africa”, expanded from the Levant into Europe and possibly into central and northern Asia. The dating of this techno-cultural transition has proved to be extremely difficult because it occurred sometime before 40,000 radiocarbon years before present (¹⁴C years BP), which is close to the end of the effective dating range of radiocarbon. Other dating methods such as Thermoluminescence (TL) or Electron Spin Resonance (ESR) are not sufficiently precise to date the recorded archaeological MP-UP transition in the Levant. Here we report a consistent set of stratified radiocarbon ages on freshly excavated charcoal from Kebara Cave, Mt. Carmel (Israel), that span the late Middle Paleolithic (MP) and Early Upper Paleolithic (EUP) This study applied novel strategies to improve sample preparation techniques and data analysis to obtain high-resolution radiocarbon models. From this study it is proposed that the MP-UP transition for this site can be placed immediately after 45,200 ± 700 ¹⁴C years BP and before 43,600 ± 600 ¹⁴C years BP or from 49/48 to 47/46 radiocarbon calibrated years before present (years Cal BP).     

Radiocarbon Dating and the George C. Davis Site,Texas

Abstract

Seventy-nine radiocarbon samples were assayed from the George C. Davis Site, a prehistoric Caddoan settlement in the central portion of east Texas. Statistical analysis of the dates convincingly establishes the age of the site as extending from about 780 A.C. to 1260 A.C. and enables us to place the cultural remains into three temporal periods. These dates also provide specific and useful examples for improving the application of radiocarbon dating to archaeological problems.     

EARLY VILLAGE LIFE IN SOUTHEASTERN INDIANA: RECENT FIELD INVESTIGATIONS AT THE GUARD SITE (12D29)

Abstract

Investigations at the Guard site (12D29), located in Dearborn County, Indiana, have provided evidence pertaining to the development of early Fort Ancient villages. Recent geophysical survey and excavations alongside many new radiocarbon dates have allowed for improved understanding of household architecture and intrasite variability. Although some scholars have hypothesized that Middle Fort Ancient villages developed out of small early Fort Ancient hamlets, the Guard site provides explicit evidence for villages early in the Fort Ancient sequence. Guard also contains key Mississippian indicators for interaction, particularly wall-trench architecture and a Ramey knife. These findings demand that we reconceptualize the inception of Fort Ancient villages.     

Palaeoeskimo Demography on Western Boothia Peninsula,Arctic Canada

Abstract

Surveys on western Boothia Peninsula in 2004 documented 483 Palaeoeskimo dwellings spanning approximately 3300 years (4500–1200 B.P. in uncalibrated radiocarbon years), about the total time range for Palaeoeskimo groups in the central Canadian Arctic. On the basis of dwelling elevations above sea level and a series of radiocarbon dates, Palaeoeskimo occupation appears to have passed through multiple boom-and-bust cycles. Following the first peopling of the region about 4500 B.P., populations rose to a maximum between about 4200 and 3600 B.P., followed by a crash. A recovery between 3200 and 2500 B.P. led to a second decline, and a final, partial recovery between 1600 and 1200 B.P. was followed by the disappearance of Palaeoeskimo groups. Although climate change cannot be ruled out as a causal factor for these cycles, there is no compelling evidence for such a scenario. Resource over exploitation is equally plausible, although we do not necessarily favor one cause over the other.

We interpret the intrasite patterns to indicate that Palaeoeskimo settlements were comprised of dispersed nuclear families or small extended families for most of the year, but annual aggregations involved 100 individuals or more. Minimal social units do not appear to have changed during seasonal aggregations in Pre-Dorset times (4500–2500 B.P.). By Dorset times (2500–700 B.P.), however, minimal social units sometimes melded together to form one or a few larger units living in one or a few large dwellings. The latter may represent the social precursor of later Dorset longhouse aggregations.     

Radiocarbon dating: Some practical considerations for the archaeologist

The article is divided into four main sections in each of which a key aspect of radio-carbon dating is discussed with emphasis on the practical implications for users of dates. The four topics which the article attempts to deal with are, in turn, (i) the effect on the radiocarbon timescale of the variations in atmospheric ¹⁴C now known to have occurred in the past and the role of other absorlute dating methods in investigating these, (ii) laboratory measurement of ¹⁴C, (iii) selection of optimum samples for dating and (iv) some of the limitations of the final dates. The theme is essentially that the technical difficulties of radiocarbon measurement in the laboratory have been overcome to the extent that the physical measurements can now be made with high precision, that is to within ±1% or better, as a routine. Thus, it is more important than ever (a) that only reliable samples having very firm associations should be dated and (b) that pretreatment of such samples by the dating laboratory to remove any age contaminants should be completely effective. However, in addition to the recognized statistical limitations, the absolute accuracy of radio-carbon dating is limited by the past ¹⁴C variations. Coupled with the requirements of proper association and pretreatment of samples is the long-term need to establish an overall correlation between radiocarbon and calendar years. At present this is still a matter for final agreement by the laboratories concerned. Meanwhile, when all possible steps have been taken to ensure the reliability of the date messurements, these can strictly only be compared with one another in terms of radiocarbon years bp. In practice this is often too restrictive but any attempts at calibration must be regarded as approximations for the time being. In this article the lower and upper case notation advocated in Antiquity46, 265, for radiocarbon and calendar years respectively has been followed.     

The use of summed radiocarbon probability distributions in archaeology: a review of methods

Using a database of Australian archaeological radiocarbon dates (n = 2996), this paper explores three key methodological issues associated with the use of summed probability plots of radiocarbon data: 1) the minimum sample size needed for a statistically reliable plot; 2) the effect of radiocarbon calibration on the structure of these plots; and 3) the application of a taphonomic correction to such time-series data. The results identify several protocols, recommended as best-practice when using summed probability plots: 1) a minimum sample size of 500 radiocarbon dates should be used, and the sample size and the mean of the standard deviations of the radiocarbon dates (ΔT) in the sample should both be reported; 2) a moving average trendline of 500-800 years should be used to offset the effects of the calibration process; and 3) Surovell et al. “Correcting temporal frequency distributions for taphonomic bias” [Journal of Archaeological Science 36 (2009) 1715-1724] is explored, with modifications and temporal limits (<25,000 cal years BP) proposed. Correction of time-series data using theoretical taphonomic correction curves is useful as a heuristic tool but can obscure real trends if applied routinely. Comparison between summed probability plots and other occupation data is presented and shows good correlation. However it is recommended that plots are supplemented by other archaeological indices and the cross-comparison of such multiple proxies will strengthen identification of occupation trends.     

Chronological Reconstruction of Natfieh Tombs,Northern Jordan

Abstract

This research radiocarbon dates human teeth and bones sampled from seven tombs from the archaeological site of Natfieh, Northern Jordan. The small number of artifact fragments uncovered, looting and disruption of the tombs in antiquity and/or recent times, and the continuity between the Greek and Roman burial traditions and similarity in tomb architecture impede determining accurate dates and chronology of the tombs. This research aims to ascertain the archaeological dates and the chronological sequence of the tombs and the artifacts uncovered. Results show that the probable earliest use of these tombs was between 90 BC and AD 20, and their probable latest use was from AD 126–236. Most probably, at Natfieh new tombs spread northward and carving the tombs started in the lower rock layers and later in the upper layers.     

RADIOCARBON MEASUREMENTS ON A FLOATING TREE-RING CHRONOLOGY FROM NORTH-EAST SCOTLAND

Radiocarbon measurements have been performed on a 250 year ‘floating’ tree-ring section recovered from an archaeological site in north-east Scotland. Short term fluctuations in atmospheric concentration appear to be superimposed on a general trend of decreasing ambient ¹⁴Cparallel with tree growth. The most significant finding is the range of dates obtained from the sequence, namely 400 years, since it implies that the error on a single radiocarbon date is considerably greater than at present accepted on the basis of analytical precision alone.     

CONFIRMATION OF AN ARCHAIC PERIOD MOUND IN SOUTHWEST MISSISSIPPI

Abstract

Site 22LI504 is a predominantly Archaic period site in Lincoln County, Mississippi. One of its primary elements of interest is a single conical mound from which small-diameter cores revealed evidence of advanced pedogenesis. A radiocarbon sample from one soil core produced a date suggesting that the mound was Archaic in age (Fulmer 2001); however, it was unclear whether the sample came from within the mound or an underlying midden. In the spring of 2006, we excavated a 1-x-1-m unit in the mound to investigate this question. Diagnostic lithic artifacts, an advanced state of soil horizonation, and a lack of ceramics indicate that the mound is of Archaic period construction, with as many as five construction stages and artifact-rich features. We describe the soil profiles, features, and artifacts recovered from the mound, with comparisons to excavation units in an adjacent Archaic midden to show that there is no clear evidence for the mound being a functionally specific locus. We also present radiocarbon dates that indicate the earthwork is over 5,000 years old. These results are evaluated within the broader context of Archaic mound building, focusing in particular on environmental parameters underlying bet-hedging behavior.     

Neolithic occupation of an artesian spring: KS043 in the Kharga Oasis,Egypt

Abstract

KS043 is a stratified site associated with a complex of artesian springs. The archaeological remains, as well as a series of radiocarbon determinations, date the site to between 4800 and 4200 b.c. Our study suggests a connection between Saharan pastoralists, forced to move into oasis areas by increasing aridification, and the first Predynastic cultures of the Nile Valley. The site is the only well dated stratified settlement attributed to the Late Neolithic in the eastern Sahara that is characterized by Tasian cultural traditions.     

The Early Man Site at Warm Mineral Springs,Florida

Abstract

An excavation in stratified sediment more than 13 m. below the present surface of Warm Mineral Springs in Florida has yielded human remains 10,000 years old. Samples of wood from the same level of sediment in the spring in which a human vertebra was discovered provided a radiocarbon date of 10,260 ± 190 years: 8310 B.C. (Gak-3998). Wood samples from the next two superior 0.10 m levels of the test also yielded dates in excess of 10,000 radiocarbon years. A second human bone, a fragmentary ilium, was recovered a few centimeters outside the excavation in the sedimentary zone. These specimens may represent the earliest closely dated human skeletal remains so far discovered in North America.

Results of a geological study are in agreement with the archeological information. Radiocarbon dates on selected charcoal samples are only slightly younger than those reported above. The stratified deposit containing the human remains accumulated on a ledge between 10 m. and 12 m. below present sea level as a series of leaf deposits interbedded with calcitic muds containing fresh-water and land snail fauna. This lower leafy bed represents a stage of fluctuating water level in an open cenote. An overlying calcitic mud with only minor amounts of terrestrial plant debris represents a higher stand of the water table in the cenote. An upper algal sludge layer represents subsequent conditions of a flowing connate spring.

It is evident that the rising potentiometric water level in this large feature correlates with the post-Wisconsin eustatic rise in sea level. The fluctuations suggested by the lowest bed containing the human remains probably indicate variation in amount of precipitation. However, even the calcitic mud and tufa encrustations and formations that formed at the highest stand of water within this event are indicative of a climate considerably more arid than now existing.

Summary geological and archeological data acquired at two other similar solution features in Florida, Little Salt Spring (8 So 18) and Devil's Den (8 Lv 44), where unarticulated human skeletal material and artifacts dating from the late Paleo and A rchaic periods have been found, are included to extend and strengthen the interpretation of the geological sequence and the theory advanced that these sites were primarily utilized as water sources during periods when surface water on the peninsula was less available. There is no evidence that the sinkholes were utilized for habitation or sites of primary burials as has been suggested.

The recovery effort marks the first successful adaptation of standard archeological techniques to the excavation of a submerged prehistoric site.