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A few displayed smaller secondary peaks interpreted as a result of redeposition or depositional variability. Three distinctive units I—III and associated subunits are delineated within the studied portion of the cores and are referenced here to Core The stratigraphy depicted represents only slightly more than the upper half of the basin-fill sequence described by Krause et al.

Within the lake itself, peat, organic-rich mud, and silt deposits nearly 6-m thick have accumulated since the Last Glacial Maximum LGM and possibly earlier based on recent work by Krause et al. White Pond core lithology can be roughly divided into three units Fig. Depositional units delineated by texture, color, sedimentary structures, and clearly defined boundaries may be discontinuities aling a change in depositional environment or may be true erosional unconformities.

As found at many terrestrial archaeological sites by Moore et al. In general, the possible routes of entry for soot into a watershed tend to be from fluvial input, local shoreline erosion, and eolian deposition. Magnetic susceptibility measurements made on a section of Core provide a proxy for composition, texture, and depositional history see Fig. Spore Spartanburg dating white with modeled ages are shown for Strongly Coprophilous spores along with the YDB spore decline and hiatus.

Introduction

Alternatively, it is possible that declining s of coprophilous fungal spores may ify microenvironmental fluctuations or a decline in small herbivores. Based on evidence from White Pond, -Lon, and other sites 341we speculate that the proposed YD impact was just one of several coeval factors, along with overhunting and climate change, that contributed to the megafaunal declines at One possible interpretation is that there was a period during the YD onset with a sudden increase in megaherbivore abundance at White Pond, followed by a rapid decline represented by the lowest spore abundance in the entire pre-Holocene record.

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If drought is confirmed, this could explain the hiatus in sedimentation immediately above the YDB layer. Thus, the presence of a soot anomaly of this magnitude in the White Pond core is consistent with large-scale regional fires coincident with the YD onset.

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Commonly called ash or tephra, this is the glassy, explosively-erupted pyroclastic products of a volcanic eruption. Following this discovery, an independent contribution by Moore et al. Petaev et al. We conducted Bayesian analysis Ramsey 2324 using OxCal v. Presumably, some areas less severely affected than others became refugia for remnant herds of megafauna. Unit IIB in several cores is visually distinct due to a slight color change indicative of oxidation and possible subaerial exposure.

These analyses included Pt, with elevated levels proposed to be associated with an ET impact 4Spartanburg dating whiteand analyses to test for coprophilous spores, sedimentary organic material including DNA, pyrogenic carbon, C and N stable isotopes, magnetic susceptibility of bulk sediments, cryptotephra, and comprehensive elemental geochemistry.

Recent studies by Wolbach et al. Pt also is elevated throughout Unit III, likely due to preferential uptake and redeposition of Pt upward in the solum by aquatic plants rooted and intrusive into Unit II, as observed in studies While trace amounts of both Pt and Pd are present at very low levels throughout, the presence of an anomalous ratio of platinum to palladium only in the YDB indicates an influx of Pt-enriched material from a exogenic source at the YD onset 4.

You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. A later study by Moore et al.

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Study of late Quaternary climates and their effect on vegetation dynamics of southeastern North America has been hampered by the limited of radiocarbon-dated pollen sequences extending from the Last Glacial Maximum LGM through the Holocene transition.

Mercury Hg concentrations of White Pond sediments were analyzed to determine if any perturbation to the Hg cycle occurred across the YDB layer. This finding is also consistent with the reported by Wolbach et al. Sediments dating to the YD onset YDB are bracketed by underlying older Pleistocene muds and overlying muddy peats that span the early to middle Holocene.

In the White Pond system, however, the punctuated interval of elevated soot in the absence of Spartanburg dating white similarly elevated influx of OC, suggests an eolian source. They conclude that the likely source of the Pt enrichment was from multiple atmospheric injections of platinum-rich dust following an extraterrestrial impact and the subsequent year-long deposition of platinum within interannual layers of ice.

Shaping and rounding of the lake have occurred through lacustrine processes common to those involved in the formation of Carolina bays i. It is possible to generate sedimentary Hg anomalies through a multitude of natural biotic and abiotic processes, including increased organic matter deposition, volcanism, biomass burning, soil and rock weathering and erosion detrital inputand local redox changes see Them et al.

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Coprophilous spore frequencies are widely used as indicators of megaherbivore population sizes. However, there are considerable difficulties with any interpretive model for multiple reasons, including the presence of the hiatus in deposition, uncertainties in the age-depth model, rapid changes in sedimentation, variability in spore preservation, potential sampling and processing errors, and high variability in the lake level.

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from White Pond indicate a decline in the abundance of multiple species of coprophilous fungi within sediments dated to the YD onset Supplementary Fig. However, estimates for the timing of the final megafaunal extinction are uncertain due to the possible unconformity within the core sediments immediately post-dating the YD onset and lasting into the early Holocene see Discussion below and Supplementary Fig.

Despite our use of targeted enrichment for mammalian DNA, the material was too poorly preserved in this warm and wet environment 29 for this approach to be successful. Moore et al. There is no independent body of evidence documenting the presence of now-extinct megafauna in the area at the YD onset. Afterward, intensive overhunting continued for decades to few centuries as Paleoindians adapted to the sudden loss of vegetative biomass for subsistence.

Early paleoenvironmental reconstructions by Watts 1 established White Pond in South Carolina as one of the oldest and most complete paleoenvironmental records in southeastern North America, with a basal core date of at least 22, calendar years BP. Watts 1 report on the Pleistocene-Holocene transition at White Pond has served as a benchmark study of paleoclimates and paleoecology for the Atlantic Coastal Plain. At White Pond, we used multiple taxa of strongly and semi-coprophilous fungal spores to minimize these possibilities 39Spartanburg dating white All fungi types in this study generally followed the same temporal pattern as Sporormiella see Supplementary Figs 1 — 4.

Data sets used in this figure come from duplicate cores Spartanburg dating white are correlated using lithostratigraphic Unit II as a common core datum see Supplementary Figs 89. Similar patterns were reported by Spencer et al. A review of the major themes of these papers was recently included in Pino et al.

Small remaining populations of megafauna persisted into the Holocene in isolated refugia away from human predation, before declining into full extinction. At White Pond, analyses of cryptotephra and Hg confirm this and provide no evidence in support of a volcanic source.

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Furthermore, the chronological sequence in the cores from the pyrogenic carbon peak, Pt anomaly, and extended Sporormiella decline is consistent with expected environmental and ecological changes resulting from multiple impacts and airbursts of a fragmented comet or asteroid 3171819 The concomitant rise in C:N ratios indicates a general increase in terrestrial organic matter litter contributions to the SOM pool for White Pond that may have also increased overall N availability.

However, Bunch et al. Additional research is necessary to resolve this issue. Under the YDIH scenario, we speculate that this is the order of events at the YD onset: multiple impacts and airbursts occurred over a brief period of time 317181920along with subsequent climate changes, Spartanburg dating white wildfires, an impact winter, and soot deposition immediately after the impact 17 This was followed by deposition of atmospheric Pt over several decades, as indicated by GISP2 ice core data reported by Petaev et al.

Our are consistent with the YD Impact Hypothesis and impact-related environmental and ecological changes. Based on a recent study from the -Lon site, it appears that the final extinction event did not occur until sometime after the YD onset during the early YD—a time for which we apparently lack a sedimentological record in the White Pond core.

On the other hand, at the -Lon site in Florida, the major decline indicating megaherbivore extinction occurs ca.

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A related possibility is that megafaunal overhunting was directly triggered by the widespread environmental disruption of traditional human food sources through geographically heterogeneous, impact-related biomass burning 17,18 and by abrupt, impact-related YD climate change. A separate analysis of core samples from White Pond found no evidence for aciniform carbon, a subset of pyrogenic carbon.

We investigate whether the White Pond record contains any of the ly reported impact proxies that are predicted by the YDIH.

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Here we report the of analyses of cores collected from White Pond in South Carolina. High concentrations of Pt have sometimes been reported in tephra and ash from some, but not all volcanic eruptions, including none in tephra from Cascade volcanoes, which represent the closest active volcanoes upwind of White Pond 4. Directly above this unit, sediments transition abruptly to a muddy, sapric peat Unit III that dates to the early Holocene. In particular, an episode of drought is suggested by the presence of oxidized sediments in Unit IIb, possibly indicative of subaerial exposure from low water levels and drought across the YD interval.

Thank you for visiting nature. For example, a recent study by Krause et al.

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We acknowledge that numerous papers have been published that criticize or take issue with one or more purported impact proxies suggested to be evidence of an extraterrestrial impact at the YD onset as originally set forth by Firestone et al. Interest in lacustrine paleoenvironmental records such as White Pond, has recently increased due to evidence of an extraterrestrial ET impact that is proposed to have caused the YD climatic anomaly 3.

Cores and consist mainly of interbedded gray clay and silt layers at the bottom, gradually replaced by organics and soft sediment deformation toward the top of the unit. In fact, the soot anomaly is the largest in the entire ca. Although yet to be dated, the impact crater exhibits evidence of a geologically young age, including the absence of pre-YD ice within the crater, evidence of residual heat, and a minimally eroded crater rim.

These are also consistent with the Younger Dryas Impact Hypothesis YDIHwhich proposed that an extraterrestrial source contributed Pt along with other reported impact proxies e. While its exact Spartanburg dating white is yet to be determined, the crater represents the largest known impact event in the last 5 million years after Kara-Kul and the second largest in the last 36 million years after Chesapeake Bay.

If a YD age is eventually confirmed, the Hiawatha impact was energetic enough to have triggered a brief impact winter, abrupt YD climate and oceanographic change, widespread biomass burning, and deposition of multiple impact proxies, as found at more than 50 sites across large portions the globe.

If so, stressed animal populations in these refugia were more easily targeted by equally stressed human populations, all struggling to survive in the aftermath of an environmental calamity.

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Most recently, Kjaer et al. This indicates that all classes of meteorites are possible sources of YDB Pt enrichment. Bayesian modeling of AMS dates Fig. A similar situation was observed at terrestrial archaeological sites in the Carolinas along the sandy Coastal Plain, in which Paleoindian and Early Archaic artifacts spanning this temporal interval are stratigraphically conflated The largest Pt anomaly is in Unit II, associated with organic-stained dark gray clay and silt.

Sediment cores from white pond, south carolina, contain a platinum anomaly, pyrogenic carbon peak, and coprophilous spore decline at ka

Furthermore, the absence of YD Hg anomalies at White Pond, like the cryptotephra analysis, suggests little to no input of volcanogenic Hg. They considered multiple potential sources for the Pt anomaly and conclude that the most likely explanation is multiple atmospheric injections of platinum-rich dust by an extraterrestrial impact, followed by fallout of Pt-rich dust during the next 21 years.

Those studies were based on analyses of large s of terrestrial, lacustrine, marine, and ice core records with peaks in biomass-burning proxies such as charcoal, pyrogenic carbon soot and aciniform carbon, as described in Wolbach et al. Furthermore, Kjaer et al. These are consistent with those ly reported by Petaev et al. When viewed in the context of rapid environmental change, these new data, along with all paleo-environmental reconstructions of the YD, suggest that the trigger was geologically instantaneous. All of these issues potentially affect the spore record at White Pond during this time and therefore, spores may not reflect actual megaherbivore abundance.

Although the evidence may yet be found, recent blood antisera residue analyses of Paleoindian stone points from the Carolinas and Georgia, representing the time interval immediately prior to the YDB, exhibited no evidence of predation on now-extinct megafauna Stable carbon isotopic atures can provide information Spartanburg dating white the sources of sedimentary organic matter SOM and soot C deposited at this site.

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Coprophilous fungi across the YDB are a potential indicator of megaherbivore presence e. The lake appears to be within a streamhead depression formed by scour and the downstream blockage of the drainage by large Pleistocene sand dunes on the south end of the lake. The usefulness of the Pt anomaly as a precise chronostratigraphic datum is demonstrated here, and its presence is best explained as the result of an extraterrestrial event.

These include analyses of coprophilous spores, sedimentary organic material including ancient DNA, stable isotope composition, pyrogenic carbon soot and aciniform carboncryptotephra, mercury Hgmagnetic susceptibility, and elemental geochemistry, including quantification of Pt and Pd.

Eolian and fluvial sand deposits surround most of the lake and are underlain by heavily weathered Cretaceous and Tertiary clayey sand deposits.

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