“Our evidence is entirely consistent with the Younger Dryas Impact Hypothesis” says Thackeray. Younger Dryas (YD) cooling, after which there is no evidence for either in situ extinct megafaunal remains or Clovis artifacts. ScienceDaily, 2 October 2019. This impact, dubbed the Younger Dryas impact hypothesis, proposes that the Earth was struck by a large asteroid or comet roughly 12,800 years ago, at the end of the Pleistocene, and may have ushered in a brief period of cooling between 12,900 and 11,700 years ago known as the Younger Dryas.This period of climate upheaval saw the extinction of numerous species of megafauna … So, don’t put your finger on the timeline, and say you are … The evidence given by proponents of a bolide or meteorite impact event includes "black mats", or strata of organic-rich soil that have been identified at dozens of Clovis culture archaeological sites in North America. Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Note: Content may be edited for style and length. “Thus, the cometary objects must have hit South America as well,” Kennett concludes. The probability of a large asteroid striking Earth in the future may seem to be low, but there are thousands of large rocks distributed primarily between Jupiter and Mars. Now the evidence of a planet-shaking flood during this time is mounting. In addition to evidence of global cooling during the Younger Dryas, the presence of carbon-rich “black mats” around 30 cm in thickness across faunal and paleoindian hunting sites suggests that an abrupt change to more aquatic conditions occurred in a small time window. NY Post Gizmodo Quartz Francis Thackeray This confirmation of a South African platinum layer from the Younger Dryas Impact was particularly welcome for several reasons. Entitled “Comprehensive analysis of nanodiamond evidence relating to the Younger Dryas Impact Hypothesis”, the first paper rakes over some very old (and long ago refuted) chestnuts favoured by Pinter and Daulton when it finds “no evidence for londsdaleite in YDB sediments and… no evidence for a spike in nanodiamond concentration at the YDB layer to support the impact … It is named after an indicator genus, the alpine-tundra wildflower Dryas octopetala, as its leaves are occasionally abundant in late … A bolide impact merely a few thousand years ago, that somehow killed off most of the megafauna leaves tiny pieces of evidence that are mostly pretty weak. Or view hourly updated newsfeeds in your RSS reader: Keep up to date with the latest news from ScienceDaily via social networks: Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. The Younger Dryas period has been documented as one of the most turbulent stages in prehistory. This mini ice age, known as the Younger Dryas, lasted around 1,000 years, and it's considered a crucial period for humanity because it was around that time agriculture and the first Neolithic civilisations arose - potentially in response to the new colder climates.The period has also been linked to the extinction of the woolly mammoth.. In this paper we review the evidence for the Younger Dryas impact hypothesis (YDIH), which proposes that at ∼12.9k cal a BP North America, South America, Europe and the Middle East were subjected to some sort of extraterrestrial event. Hence, the question is perhaps not so much one of “where is the evidence,” but instead who is willing to look at it? The biggest problem with Younger Dryas impact crater hunters is their insistence on describing everything as evidence for their pet hypothesis. Brakenridge also discusses pollen-core research that suggests global cooling conditions did not only occur in … Much of the putative evidence for a YD impact 24 YOUNGER DRYAS IMPACT EVENT is irreproducible. The paper appeared on March 13 in Scientific Reports and can be viewed online here. www.sciencedaily.com/releases/2019/10/191002110329.htm (accessed February 28, 2021). Study finds new evidence supporting theory of extraterrestrial impact (Santa Barbara, Calif.) –– An 18-member international team of researchers that includes James Kennett, professor of earth science at UC Santa Barbara, has discovered … Questions? However, a, “Thus, the cometary objects must have hit South America as well,” Kennett concludes. The discovery in South Africa is expected to be integrated with those made in other parts of the world, recognising that the source of the platinum at Wonderkrater could hypothetically be cosmic dust that was dispersed in the atmosphere after a meteorite impact in Greenland. Younger Dryas spikes in platinum have also been found in Greenland, Eurasia, … Many asteroids are situated between Mars and Jupiter, and on occasion some come very close to our planet. The Younger Dryas Impact Hypothesis, and the evidence to support it, is a reminder of how much can change when a rocky object hits the earth. Did Teen 'Tyrants' Outcompete Other Dinosaurs? It also saw the end of the North American Clovis culture. The Younger Dryas Impact Hypothesis proposes that the onset of the Younger Dryas climate reversal, Pleistocene megafaunal extinctions and disappearance of the Clovis paleoindian lithic technology were coeval and caused by continent‐wide catastrophic effects of impact/bolide events in North America. ScienceDaily. Now the evidence … The Younger Dryas impact hypothesis suggests that multiple extraterrestrial airbursts or impacts resulted in the Younger Dryas cooling, extensive wildfires, megafaunal extinctions and changes in human population. Views expressed here do not necessarily reflect those of ScienceDaily, its staff, its contributors, or its partners. One of these new ideas is the Younger Dryas Impact Hypothesis. In 2013, Jacobsen examined an ice core from the center of Greenland , 1000 kilometers away. It is not intended to provide medical or other professional advice. For years, researchers have postulated that the existence of these tiny baubles strewn throughout Abu Hureyra is evidence the ancient village was part of what's known as the Younger Dryas impact hypothesis: the contention that a disintegrating comet or asteroid struck Earth 12,800 years ago, showering four separate continents in a fiery rain of destruction so intense, it … SARS-CoV-2 Antibodies: Low Risk of Re-Infection, Supermassive Black Holes from Dark Matter, Creating Neurons for Regenerative Medicine, Whale Sharks Show Strong Recovery from Injuries, Air Pollution, Kids: Higher Disease Risk Later, Potentially Harmful Chemicals in Plastic Toys, Temperature record of the past 1000 years, Meteoric Evidence for a Previously Unknown Asteroid, Mutated Ferns Shed Light on Ancient Mass Extinction, Cold Extermination: One of Greatest Mass Extinctions Was Due to an Ice Age and Not to Earth's Warming, Studies Refute Hypothesis on What Caused Abrupt Climate Change Thousands of Years Ago, Three Reasons Why COVID-19 Can Cause Silent Hypoxia, Boys Who Play Video Games Have Lower Depression Risk, Largest Cluster of Galaxies Known in the Early Universe, Microbes Deep Beneath Seafloor Survive on Byproducts of Radioactive Process, Comet Makes a Pit Stop Near Jupiter's Asteroids, Quantum Quirk Yields Giant Magnetic Effect, Where None Should Exist. UC Santa Barbara geology professor emeritus James Kennett, also a co-author on the new paper, says at least one of the discoveries made at Pilauco, Chile, was unique to the site. But although the Younger Dryas … In-creasing evidence suggests that the extinction of many mammalian and avian taxa occurred abruptly and perhaps catastrophically at the onset of the YD, and this extinction was pronounced in North Materials provided by University of the Witwatersrand. "We cannot be certain, but a cosmic impact could have affected humans as a result of local changes in environment and the availability of food resources, associated with sudden climate change.". • There is no unambiguous and diagnostic evidence to support the claim that there was a Younger Dryas impact event. The Younger Dryas Impact Hypothesis, and the evidence to support it, is a reminder of how much can change when a rocky object hits the earth. The Younger Dryas Impact Hypothesis is highly controversial. This is the first evidence in Africa for a platinum spike preceding climate change. The team, led by Professor Francis Thackeray of the Evolutionary Studies Institute at the University of the Witwatersrand in Johannesburg, South Africa, discovered evidence of a remarkable "platinum spike" at a site called Wonderkrater in the Limpopo Province, north of Pretoria in South Africa. But it's not impossible. Taking on the dogmatic uniformitarians. "Our evidence is entirely consistent with the Younger Dryas Impact Hypothesis" says Thackeray. Younger Dryas (YD) cooling, after which there is no evidence for either in situ extinct megafaunal remains or Clovis artifacts. • Questions remain regarding the origin of the nanodiamonds, lechatelierite and magnetic spherules. The Younger Dryas is the period between 12,900 to 11,700 years BP. "The closest encounter will take place precisely on Friday April 13, 2029," says Thackeray. What do magnetic and glassy impact-related spherules, nanodiamonds, carbon spherules, biomass burning, and anomalous levels of platinum and chromium in ancient sediment layers all have in common? The in situ bones of extinct Pleistocene megafauna, along with Clovis tool assemblages, occur below this black layer but not within or above it. The evidence is there in the field and it continues to stack up. Mysterious Universe is a property of 8th Kind Pty Ltd, Evidence for large scale climate changes related to these proposed impacts or air bursts had been found already on several continents. The paper appeared on March 13 in. It brought the last ice age to an end. There have been no further reports since 2015 that dispute the Younger Dryas impact theory on the basis of new evidence for these specific lines of geochemical signal. "If this was indeed the case, there must have been global consequences.". Thackeray’s team believes their discovery of a platinum spike at about 12 800 years ago at Wonderkrater is just part of the strengthening view that an asteroid or cometary impact might have occurred at that time. The South African research has been supported by the National Research Foundation and the DST/NRF Centre of Excellence for the Palaeosciences. The Younger Dryas Event is what caused a large megafaunal extinction, seeing the end of woolly mammoths, species of bison, American horses and camels, and giant sloths. Core samples from White Pond near Elgin, South Carolina, show evidence of platinum spikes and soot indicative of an impact … However, archaeological evidence also seems to indicate that human populations were affected at the same time; presumably a result of the same environmental changes. It is highly improbable that a significant Academy of Sciences, vol. This is the first evidence in Africa for a platinum spike preceding climate change. Wonderkrater is the 30th site in the world for such evidence. Remarkably, archaeologists in South Africa have detected an almost simultaneous termination of the Robberg stone artefact industry associated with people in some parts of the country, including the area around Boomplaas near the Cango Caves in the southern Cape, close to the town of Oudshoorn. A sudden collapse of global climate around 12.8 ka and equally brusque warming 11.5 ka ago is called the Younger Dryas. Posted in: Uncategorized. Published on May 14, 2019 June 27, 2019 by zooks777. However, a new study titled “Sedimentary record from Patagonia, southern Chile supports cosmic-impact triggering of biomass burning, climate change, and megafaunal extinctions at 12.8 ka,” argues that features remarkably similar to existing North American sites associated with the Younger Dryas Boundary (YDB) were found at the South American archaeological and paleontological site of Pilauco Bajo. From the University of California – Santa Barbara. ... One of the first lines of evidence was when... 3. Human populations may also have been indirectly affected at the time in question. A carbon-rich black layer, dating to ≈12.9 ka, has been previously identified at ≈50 Clovis-age sites across North America and appears contemporaneous with the abrupt onset of Younger Dryas (YD) cooling. Copyright © Mysterious Universe. Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling. A large crater 31 kilometres in diameter has been discovered in northern Greenland beneath the Hiawatha Glacier. Global Wildfires. Meanwhile, evidence in its favor continues to accumulate. The Younger Dryas impact hypothesis contends that around 12,800 years ago, a disintegrating comet or asteroid led to an impact event—or maybe several—along with possible airbursts which resulted in widespread fires and climate changes identified in relation to the Younger Dryas … Thackeray, J. Francis; Scott, Louis; Pieterse, P. Younger Dryas spikes in platinum have also been found in Greenland, Eurasia, North America, Mexico and recently also at Pilauco in Chile. After the hypothesis was first published in 2007, it gained much criticism, as the evidence presented was either not indicative of an extraterrestrial impact or not … Twin Atoms: A Source for Entangled Particles, An Intelligent Soft Material That Curls Under Pressure or Expands When Stretched. ScienceDaily. Is the Younger Dryas Dispute Settled? Along with disrupting the glacial ice-sheet and shutting down ocean currents, this hypothesis holds that the extraterrestrial impact also triggered an “impact winter” by setting off massive wildfires that blocked sunlight with their smoke. Many mammals became extinct in North America, South America and Europe at the time of the Younger Dryas. It is now hypothesized that this could have been caused by a meteorite impact, the Clovis meteorite. Problems with gradual glacial melt theory: 1) Global warming evidence 236–282, The stone et al. Proc Nat Acad Sci … University of the Witwatersrand. The evidence is there in the field and it continues to stack up. Brien Foerster Published on … Critics primarily argue that meltwater from the glaciers at the end of the Pleistocene spilled into the Atlantic as global temperatures began to naturally warm, causing a cooling effect that disrupted ocean currents that led to further cooling prevalent throughout the Northern Hemispheres. Evidence for the Younger Dryas impact hypothesis has been found in North America, Europe, western Asia, and South America, along with a possible impact feature identified at Greenland’s Hiawatha Crater. "African evidence support Younger Dryas Impact Hypothesis." Causes for the … “In the most extensive investigation south of the equator, we report on a ~12,800-year-old sequence at Pilauco, Chile (~40°S), that exhibits peak YD boundary concentrations of platinum, gold, high-temperature iron- and chromium-rich spherules, and native iron particles rarely found in nature.”, As I noted elsewhere in relation to the new Chilean discoveries, “The significance of the platinum concentrations and other metallic signatures at the Chilean site presents another unique identifier, with relevance to previous studies that located an anomalous abundance of the rare earth metal at several YDB sites, as well as within ice core samples from the Greenland Ice Sheet. Content on this website is for information only. Second, the lead author, […] The evidence is mounting that the cause of the Younger Dryas’ cooling climate came from outer space. University of California, Santa Barbara Researchers have discovered new evidence to support the Younger Dryas Impact Hypothesis, which postulates that a … The Younger Dryas Boundary impact hypothesis claims that the impact altered Earth’s climate, causing a cold spell that lasted for 1,300 years. One in particular, classified as Apophis 99942, is referred to as a "Potentially Hazardous Asteroid." Were The Carolina Bays Formed by Frozen Debris From a Comet Impact? The Younger Dryas hypothesis simply claims that the cosmic impact was the trigger for the meltwater pulse into the oceans. Proc Nat Acad Sci … No matter how hard you look, 60 or 600 researchers, it is not there. A carbon-rich black layer, dating to ≈12.9 ka, has been previously identified at ≈50 Clovis-age sites across North America and appears contemporaneous with the abrupt onset of Younger Dryas (YD) cooling. Have any problems using the site? Others have postulated that the Younger Dryas event was caused by a meteor impact. Others have postulated that the Younger Dryas event was caused by a meteor impact. 9 years ago. Wonderkrater is the 30th site in the world for such evidence. The Younger Dryas Impact Hypothesis proposes that the onset of the Younger Dryas climate reversal, Pleistocene megafaunal extinctions and disappearance of the Clovis paleoindian lithic technology were coeval and caused by continent‐wide catastrophic effects of impact/bolide events in North America. It should be noted that there is not one single Younger Dryas (YD) impact hypothesis but several that conflict with one another regarding many significant details. Like the sasquatch hunters, the Younger Dryas impact supporters have a hypothesis and try to find evidence, instead of putting together all of the evidence and forming a hypothesis. It is 340 meters wide and will come exceptionally close to the Earth in 10 years' time. This appears to have settled the matter. Posted by Arem, Nick's Son on May 5, 2018. We seriously need to explore the view that an asteroid impact somewhere on earth may have caused climate change on a global scale, and contributed to some extent to the process of extinctions of large animals at the end of the Pleistocene, after the last ice age.". Leave a Comment. Financial support for ScienceDaily comes from advertisements and referral programs, where indicated. The Younger Dryas Event is what caused a large megafaunal extinction, seeing the end of woolly mammoths, species of bison, American horses and camels, and giant sloths. African evidence support Younger Dryas Impact Hypothesis. (2019, October 2). It doesn’t... 2. New Evidence For Younger Dryas Impact Found by Researchers in South Africa Posted on October 3, 2019 October 3, 2019 Author Micah Hanks An anomalous abundance of platinum discovered at an archaeological site in South Africa offers support in favor of a controversial theory, which attributes abrupt climate changes that occurred 12,800 years ago to a possible cometary impact. It also saw the end of the North American Clovis culture. There is an age discrepancy between different sites where proposed impact markers have been found. Younger Dryas spikes in platinum have also been found in Greenland, Eurasia, North America, Mexico and recently also at Pilauco in Chile. The Evidence for the Younger Dryas Impact Hypothesis 1. Here’s a hint: it involves a controversial theory about an ancient cataclysmic event… and one that is gaining new support, after an international team of scientists found compelling new evidence for its cause in South America. The Younger Dryas Comet hypothesis; The Younger Dryas Solar Flare hypothesis; While the consensus is not in, a cataclysmic demise of the North American Ice sheet may solve issues of the gradual melt theory. At Wonderkrater, the team has evidence from pollen to show that about 12 800 years ago there was temporary cooling, associated with the "Younger Dryas" drop in temperature that is well documented in the northern hemisphere, and now also in South Africa. TM apparently was set off by the observation by Vince Causey that the evidence for a possible extraterrestrial impact origin for the YD implies that “the Younger Dryas was not part of a ‘natural rhythm’, that the natural rhythm induced ice age … The period is known as the Younger Dryas, named for the flower Dryas octapetala which had thrived in the colder climate of both the Pleistocene and the cold reversal associated with the Dryas, was once thought to be the result of natural temperature changes associated with the end of the ice age. Get the MegaPack collection now for this great price. Today climate change science reveals that two or even three-degree changes would have drastic results to the earth. In-creasing evidence suggests that the extinction of many mammalian and avian taxa occurred abruptly and perhaps catastrophically at the onset of the YD, and this extinction was pronounced in North America where at least 35 mammal genera disappeared … 822, Near-Earth Objects: The United impact event happened during YD, as conceived by Fire- Nations Conference, edited by J. L. Remo, pp. The in situ bones of extinct Pleistocene megafauna, along with Clovis tool assemblages, occur below this black layer but not within or above it. "Without necessarily arguing for a single causal factor on a global scale, we cautiously hint at the possibility that these technological changes, in North America and on the African subcontinent at about the same time, might have been associated indirectly with an asteroid impact with major global consequences," says Thackeray. [2007]. The Time a Circus Showman was Cursed by His Own Freaks, 90-Million-Year-Old Dinosaur Was the First of its Kind Found in Asia, Here’s Why There Were No Medium-Sized Carnivorous Dinosaurs (Except in the Movies). Thackeray's team believes their discovery of a platinum spike at about 12 800 years ago at Wonderkrater is just part of the strengthening view that an asteroid or cometary impact might have occurred at that time. First, it is another confirmation of evidence for the impact in the Southern Hemisphere, following the Pilauco paper from Chile in March of this year. But every attempt to refute the impact evidence has in turn been refuted and the case for the Younger Dryas comet is now so compelling that it is time to widen the debate. Can a Robot Operate Effectively Underwater? The platinum anomalies (Petaev et al., 2013 and Moore et al., 2017) comprise the first (and just about only) relatively unambiguous pieces of evidence for a significant bollide … Working with researcher Philip Pieterse from the University of Johannesburg and Professor Louis Scott of the University of the Free State, Thackeray discovered this evidence from a core drilled in a peat deposit, notably in a sample about 12 800 years old. Noting that meteorites are rich in platinum, Thackeray said "Our finding at least partially supports the highly controversial Younger Dryas Impact Hypothesis (YDIH). "African evidence support Younger Dryas Impact Hypothesis." Sure, there might have been an impact. The Younger Dryas was a period of large temperature fluctuations. Underlying peats provide maximum ages on till and outwash evidently emplaced during the Younger Dryas (YD) climatic event. ScienceDaily shares links with sites in the. Evidence for large scale climate changes related to these proposed impacts or air bursts had been found already on several continents. This research was published in Palaeontologia Africana. Causes for the … The Younger Dryas impact hypothesis remains controversial, largely due to the fact that its deterrents feel that the Younger Dryas can be explained more simply as a climate event unto itself. During this period, the temperatures in Greenland suddenly started to drop. There has long been a fair amount of skepticism about the Younger Dryas impact hypothesis, to put it lightly. The probability of a large one striking earth may seem to be low.
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