Impact-Related Proxies, Environmental Change, and Faunal Extinctions across the Younger Dryas Boundary in Hall's Cave, Texas: Supporting Information

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1. 1

   Identification of a New England Bolide Impact Site: A Geologic Reckoning with the Ground-Zero for the Younger Dryas Impact Event

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   Younger Dryas impacts — title watchAshley GjøvikMarch 21, 2026

   This paper began as an attempt to understand the geology of the Boston Basin for purposes determining a risk profile and remediation plan as part of a Clean Water Act legal notice. That research resulted in an assessment that no coherent, evidence-based explanation for the geology of the Boston Basin exists in the published literature. However, the literature captured extensive evidence that could be analyzed under new theories and methodologies. Over a century of geological surveys, engineering boring logs, and geotechnical investigations have documented a suite of anomalies that the prevaili

   Original source ↗Science & psychologySpeculative history & mysteries
2. 2

   Younger Dryas Impact Hypothesis

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   Younger Dryas impacts — title watchKailey Ellison, Julian Albanil, Palmer, Hannah, Charlie SanchezMarch 27, 2026

   The Younger Dryas Period, dating approximately 12,800 years ago, is characterized by an abrupt cooling event associated with widespread ecological disruption and mass extinction. Evidence suggests that this rapid climate shift may have been triggered by a cosmic event, forming the basis of the Younger Dryas impact hypothesis. This study compares sedimentary markers associated with the Younger Dryas with those found at known high-energy impact sites, including comets, airbursts, and lightning-related events. To establish a baseline for cosmic impact features, we analyzed soil and mineral sample

   Original source ↗Speculative history & mysteries
3. 3

   A spatial gradient without a radial signature: a county-level test of the Younger Dryas impact hypothesis demographic prediction in PIDBA (analysis code and data)

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   Younger Dryas impacts — title watchElliot AllanApril 17, 2026

   Analysis scripts and computed outputs for the manuscript 'A spatial gradient without a radial signature: a county-level test of the Younger Dryas impact hypothesis demographic prediction in PIDBA' (submitted to the Journal of Archaeological Science: Reports). Includes the original May 2026 analysis scripts (test specifications and decision thresholds fixed in code, git-timestamped 2026-05-26) and the August 2026 subsequent robustness analyses (summed fluted-point denominator, PIDBA August 2026 release, and the spatial-shape falsification battery). The primary result: a robust spatial gradient

   Original source ↗Science & psychologySpeculative history & mysteries
4. 4

   The Late Pleistocene Catastrophe: A Cross-Disciplinary Framework Aligning Younger Dryas Impact Evidence, Postglacial Flood Geology, and Oral Tradition Methodology

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   Younger Dryas impacts — title watchPaul Alfred OldridgeJune 15, 2026

   Framework v0.1 circulated April 2026. Aligns Younger Dryas Boundary geological evidence, postglacial flood geology, and oral tradition methodology in a single cross-disciplinary framework. Proposes osmium isotope analysis on the Lake Towuti sediment core as the discriminating proxy between cosmic impact and volcanic origin of the YDB platinum group element signal. Incorporates the demonstrated capacity of oral tradition to preserve event-shape information across 7,000 to 13,000 years (Nunn and Reid 2016), and the genetic record of late Pleistocene human population diversity including Neanderth

   Original source ↗Speculative history & mysteries
5. 5

   Abu Hureyra, Syria, Part 3: Comet airbursts triggered major climate change 12,800 years ago that initiated the transition to agriculture

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   openalexAndrew M. T. Moore, James P. Kennett, W. M. Napier, Malcolm A. LeCompte, Christopher R. Moore, Allen WestJanuary 1, 2023

   This study investigates the hypothesis that Earth collided with fragments of a disintegrating comet, triggering Younger Dryas climate change 12,800 years ago. This collision created environmental conditions at Abu Hureyra, Syria, that favored the earliest known continuous cultivation of domestic-type grains and legumes, along with animal management, adding to the pre-existing practice of hunting-and-gathering. The proposed airburst coincided with a significant decline in local populations and led to architectural reorganizations of the village. These events immediately followed the deposition

   Original source ↗Speculative history & mysteries
6. 6

   Large Pt anomaly in the Greenland ice core points to a cataclysm at the onset of Younger Dryas

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   openalexMichail I. Petaev, Shichun Huang, S. B. Jacobsen, Alan ZindlerJuly 22, 2013

   One explanation of the abrupt cooling episode known as the Younger Dryas (YD) is a cosmic impact or airburst at the YD boundary (YDB) that triggered cooling and resulted in other calamities, including the disappearance of the Clovis culture and the extinction of many large mammal species. We tested the YDB impact hypothesis by analyzing ice samples from the Greenland Ice Sheet Project 2 (GISP2) ice core across the Bølling-Allerød/YD boundary for major and trace elements. We found a large Pt anomaly at the YDB, not accompanied by a prominent Ir anomaly, with the Pt/Ir ratios at the Pt peak exce

   Original source ↗Speculative history & mysteries
7. 7

   Demystifying The Great Flood of Noah in Islamic Narrations: Deconstructing Maritime Anachronisms, An Etymological and Geological Reconstruction of Noah's Ark as a Subterranean Neolithic Settlement. [Indonesian Language]

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   Younger Dryas impact researchNuwn NuwnOctober 10, 2026

   There is no contradiction . The traditional textual interpretations of Noah's Ark as a global, conventional wooden ship inherently conflict with the laws of material physics (structural elasticity versus mass load), biogeographical distribution of endemic fauna, and global hydrological constraints. This working paper proposes a novel alternative hypothesis by shifting the paradigm from a maritime vessel to a highly secure, terrestrial, semi-subterranean bunker complex equipped with ancient disaster-mitigation technologies. Contextualized during the Late Younger Dryas or a Meltwater Pulse event

   Original source ↗Speculative history & mysteries
8. 8

   High‐Resolution Temperature and Precipitation Variability in Northeast Asia Since the Last Glacial Maximum Recorded in an Annually Laminated Maar Lake

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   Younger Dryas impact researchDeke Xu, Jiatong Lu, Guoqiang Chu, Caiming Shen, Ning Tan, Anning Cui, Hao Li, Baoshuo Fan, et al.October 12, 2026

   Abstract Temperature and precipitation variability in monsoonal Asia is central to understanding regional climate dynamics and global teleconnections. How post‐LGM warming and hydroclimate change unfolded in Northeast Asia, and how they were linked to external forcing, remain poorly constrained. Here we present high‐resolution pollen‐derived reconstructions of mean annual temperature (MAT) and precipitation (MAP) from Xiaolongwan Maar Lake, spanning the Last Glacial Maximum (LGM) to the present. From the LGM to the mid‐Holocene, MAT increased by ∼9.0 ± 2.2°C and MAP by ∼470 ± 121 mm. During ∼1

   Original source ↗Speculative history & mysteries
9. 9

   Multidisciplinary insights into Late Pleistocene-Holocene palaeoenvironment at the archaeo-palaeontological Loltún Cave site in Yucatán, Mexico

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   Younger Dryas impact researchÓ. Solís Torres, D. ; https://orcid.org/0000-0002-7105-5872 Jha, J. Arroyo-Cabrales, H. Barba-Meinecke, José Huchím-Herrera, Hugo E. Salgado-Garrido, Guillermo Oñate-Angulo, Jaime Urrutia Fucugauchi, October 12, 2026

   Abstract A lack of well-dated archaeological and palaeontological sequences containing proxy-based palaeoenvironmental information has hindered the reconstruction of long-term human-biodiversity interactions in Mexico. Here, we re-evaluate the stratigraphy of the Huechil Chamber in Loltún Cave, a key Yucatán site whose archaeo-palaeontological sequence, dating from the Pleistocene to the Late Holocene, provides critical insights into the environmental conditions that shaped human settlement from near the onset of our species’ presence in this part of the world. Despite localised disturbances,

   Original source ↗Speculative history & mysteries
10. 10

    Chironomid-based Late Glacial and Early Holocene summer temperature variability in Lake Prokoško, Vranica Mountains, Bosnia and Herzegovina (Western-Balkan region)

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    Younger Dryas impact researchEszter Tombor, Aneta Formáčková, János László Korponai, Veronika Szilágyi, Ingo Feeser, Walter Dörfler, Christel van den Boogard, Johannes Müller, et al.October 13, 2026

    This dataset contains multiproxy palaeoecological and geochemical data used to reconstruct Late Glacial and Early Holocene environmental and climatic changes at Lake Prokoško (1670 m a.s.l.), located in the Vranica Mountains, Bosnia and Herzegovina. The primary research objective was to provide a high-resolution, quantitative mean July air temperature (TJuly) reconstruction for the climatically transitional Western Balkan region, and to evaluate the spatial expression of the Younger Dryas (YD) cooling along the European West-East summer climatic gradient. Data were collected from an 11.4 m con

    Original source ↗Speculative history & mysteries
11. 11

    Introduction to Archaeological Science

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    Younger Dryas impact researchAndrea Dolfini, Lisa‐Marie Shillito, Eric D. TourignyOctober 14, 2026

    Introduction to Archaeological Science offers a clear, comprehensive introduction to archaeological science for students encountering the field for the first time. This book presents the principal areas that shape contemporary archaeological science, combining accessible explanations with strong conceptual foundations. It introduces the development of the discipline from the 19th century to the present, before exploring relative and absolute dating methods; past environments and climate; geoarchaeology; archaeobotany; zooarchaeology; human osteology; biomolecular archaeology, including ancient

    Original source ↗Science & psychologySpeculative history & mysteries
12. 12

    In defence of the Little Ice Age glacier hypothesis in the Cairngorm Mountains

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    Younger Dryas impact researchMartin P. Kirkbride, Stephan Harrison, Ann V. Rowan, Jeremy Everest, Neil F. Glasser, Jasper Knight, Stephanie MillsOctober 15, 2026

    Ballantyne [2026. Did the Cairngorm Mountains support glaciers during the Little Ice Age? Scottish Geographical Journal (this issue)] expresses scepticism of the evidence for glacier ice during the Little Ice Age (LIA) in Coire an Lochain (Cairngorm Mountains), arguing that the Holocene exposure ages of moraine boulders [Kirkbride, M.P., Everest, J.D., Benn, D.I., Gheorghiu, D. M. & Dawson, A.G. (2014). Late-Holocene and Younger Dryas glaciers in the northern Cairngorm Mountains, Scotland. The Holocene, 24 (2), 141–148] reflect exhumation by snow avalanches, and suggests that a LIA glacier cou

    Original source ↗Speculative history & mysteries