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radiocarbon dating. Sample LP gave a conventional radiocarbon age of. 25, ± RCYBP, corrected by δ13C at 0±2. This sample is strati-.
Elizabeth J. Although this pattern has been extensively investigated, its causal mechanisms remain elusive. Much of this difficulty is related to the spatial and temporal discontinuity of sites dating to the period leading up to the extinctions. Due to its removal from glacial conditions, southeastern North America provides a unique window into ecosystem dynamics just prior to human arrival in the region. We compare these data to those from similarly aged middle and late Rancholabrean localities from Florida and demonstrate the presence of a vegetation gradient with elevated levels of C 3 vegetation at higher latitudes.
We hypothesize that this pattern may have contributed to previously described migratory patterns of mastodon Mammut populations in southeastern North America. Our data indicate more exaggerated seasonal dietary variability in these taxa at Clark Quarry relative to those collected from the interglacial locality of Waccasassa River in Florida, providing additional evidence for the significant influence of glacial dynamics in structuring North American ecosystems.
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Radiocarbon vs. Calendar vs. Years Ago
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these sites contain undisturbed subsurface deposits dating to early While Folsom has been dated to 10,, rcybp (Meltzer ).
Toggle navigation. ScholarsArchive OSU. Advanced Search. Home Graduate Thesis Or Dissertation. Copy link. Abstract Excavations conducted at Indian Sands CUC , located along Oregon’s southern coast, during and identified two discreet, artifact-bearing stratigraphic units. The late Pleistocene lithic assemblage at CUC provides the earliest evidence for human presence on the Oregon coast to date. Analysis performed on the late Pleistocene assemblage addresses the validity of existing hypotheses regarding the nature of early Oregon coastal hunter-gatherer technological and subsistence strategies.
These hypotheses are focused on whether early populations on the Oregon coast practiced a generalist-forager or collector subsistence strategy. Using theoretical approaches that deal with the organization of hunter-gatherer technology, analyses were conducted on the lithic tool and debitage assemblages at CU- 67C in order to infer past hunter-gatherer behavior. Through the implementation of multiple tool and debitage analysis methodologies, issues of hunter-gatherer mobility, raw material procurement, stages of lithic reduction, tool production, and site function are presented.
The data generated by the late Pleistocene lithic assemblage at CUC are compared with the overlying surficial assemblage, additional early sites along the North American Pacific coast, and to contemporaneous sites located further inland within the Pacific Northwest region.
Samuel Stockton White V. The site was accidentally discovered in , leading to the unfortunate destruction of its archaeological context. Included in the recovered elements of the site are the fragmentary human remains of two individuals, as well as approximately lithic and osseous tools diagnostic of Clovis Culture technology.
an age range of –10, RCYBP (2σ calibrated results range from to Equus lambei specimen, which has been 14C dated to 20, ± RCYBP.
The faunal remains yielded information on the paleoenvironmental evolution of this enclosed basin, the taphonomy, the subsistence systems, and use of the Patagonian region by the earliest hunter-gatherer populations. Two strata in the site were defined. The upper one is an aeolian unit U1 ; the lower is a paleosol containing five units from top to bottom U2-U6 based on the sedimentological characteristics.
Radiocarbon dating confirmed two occupational events. Likewise, U5 contains more extinct species than U4. However, there are no extinct species in Unit 2, where Lama guanicoe dominates the spectrum. The disappearance of taxa from U6 to U4 suggests two possibilities, sample bias or differential extinction of Pleistocene fauna. Based on comparative studies of other archaeological contexts of similar antiquity in the Patagonian region, the second hypothesis seems more reliable.
Both depositional zones contain archaeological remains that are interpreted as two different hunting events in the human colonization of the region.
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The hydrology of the Whitefish Dunes pond is now apparently dependent on ground water recharge from local precipitation that infiltrates into the dunes and from Clark Lane, making it very sensitive to low magnitude, short term climate fluctuations. Changes in lithology, molluscan species diversity, oxygen isotopes from gastropod shells, and sediment organic content permit division of the core into several intervals representing different environmental regimes. The oldest Holocene sediments recorded in the core are an organic rich layer dated at RCYBP, which accumulated in a depression on the surface of a sand bar.
Continued rise in the local water table during the Nipissing Transgression produced paludal conditions in the area, which were followed by the onset of lacustrine conditions. During this interval, the area supported a diverse molluscan fauna.
years to at least years, with the last dated event likely occurring radiocgbon years before present (RCYBP). Significant x’•C age overlaps of at.
The authors determined using a model that this genetic pattern could be explained by an ancient hybridization event resulting from female polar bears cavorting with male brown bears in SE Alaska. I had some issues with the way the paper was promoted by some of the co-authors, which I dealt with separately here. More importantly, I found the scenario these geneticists offered to explain how hybridization might have occurred to be patently implausible.
Geological and fossil evidence from SE Alaska largely refutes their scenario, although another explanation may be more tenable. It is not impossible, in my opinion, that hybridization occurred in SE Alaska during the last Ice Age, but if it did, it almost certainly did not happen the way Cahill and colleagues suggest.
Cahill et al. Figure 1. Lower: Figure 2. Heaton, U. Click to enlarge. I have no conceptual difficulty with a few polar bears mating with brown bears in SE Alaska at the end of the last ice age and no serious quibble with the genetic results themselves, as I understand them but see the caveats in footnote 1 below.
What Does cal BP Mean?
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. Excavations conducted between and at 30 sites on Espiritu Santo and La Partida islands in Baja California Sur, Mexico, reveal a long record of cultural occupation with shell middens located in caves, rockshelters, and on mesa tops. Cultural occupation began during the terminal Pleistocene at the J17 Covacha Babisuri and J69E La Ballena 3 sites and intensi ed during the early Holocene in open mesa and some rockshelter sites.
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discovered that post-date Paleoindian cultures in North America, if the commonly used dates of ~11, RCYBP to ~10, RCYBP are used to set the timeline.
Some archaeologists have suggested that people may have managed animal populations during the Archaic Period. Management of populations could include practices such as improving the habitat for a particular species or not hunting female animals during the reproductive season to ensure the growth of the population. Attempts to demonstrate management often include assessment of the numbers, ages, and sexes of the animals in a faunal assemblage. Archaeozoologists are reviewing evidence for potential Archaic Period management of turkey populations in the Eastern United States.
We currently have no evidence for management of turkeys in the Illinois area during the Archaic Period. Some zooarchaeologists have suggested that prehistoric peoples may have managed turkeys Meleagris gallopavo in the Eastern United States. There is evidence that turkeys were managed or domesticated in Mesoamerica by 2, years ago and in the Southwestern United States by 2, years ago.
Tanya Peres of our research team and Kelly Ledford have argued that late prehistoric Mississippian peoples in the Southeastern United States may have managed turkeys around 1, years ago. You may remember from our Clues from Bones section that turkeys are sexually dimorphic. The males are much larger than the females. Peres and Kelly measured the turkey bones and discovered that both female and male turkey remains were present in Mississippian assemblages.
The numbers of males present was equal to or greater than the numbers of females. The absence of medullary bone See Clues from Bones section in bones from females, suggests that females were not taken during the egg-laying period. They argue that the lower representation of females and absence of females taken during the egg-laying season could represent management of turkey populations.
Clovis (Pg 12 61)
The initials BP or bp and rarely B. While BP is also used generally as an imprecise estimate of an age of an object or event, the use of it in science was made necessary by the quirks of the radiocarbon methodology. Radiocarbon dating was invented in the late ‘s, and within a few decades, it was discovered that while the dates retrieved from the method have a sound, repeatable progression, they are not a one-to-one match with calendar years.
Most importantly, researchers discovered that radiocarbon dates are affected by the amount of carbon in the atmosphere, which has fluctuated greatly in the past for both natural and human-caused reasons such as the invention of iron smelting , the Industrial Revolution , and the invention of the combustion engine. Tree rings , which keep a record of the amount of carbon in the atmosphere when they are created, are used to calibrate or fine-tune radiocarbon dates to their calendar dates.
Scholars use the science of dendrochronology, which matches those annular rings to known carbon fluctuations.
Radiocarbon Date: to (uncalibrated RCYBP, ISGS, Napoleon component). Radiocarbon Date: to (uncalibrated RCYP, ISGS
Springer Professional. Back to the search result list. Table of Contents. Hint Swipe to navigate through the chapters of this book Close hint. Abstract Paleontological sites in Argentina with continental vertebrates corresponding to the Marine Isotope Stage 3 MIS 3 interval are scarce or poorly known. This situation is mainly due to the lack of absolute ages for Pleistocene fossil remains or their bearing sediments that would allow the verification of the chronology established for this interval.
However, a few isolated evidences show that continental vertebrates responded to the abrupt temperature changes that characterized the MIS 3 Heinrich colder events and Dansgaard—Oeschger warmer events. A larger amount of absolute datings of the bearing sediments and especially taxon dates are needed to determine more accurately the response of the fauna to the climate changes characteristic of MIS 3.
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