Exploring abrupt climate change induced by comets and asteroids during human history

[Repost] Swiss Bliss

OK, back in the saddle again. Sorry for the scrambled first slide here, but the presentation Scribd below was given by Malcolm LeCompte at the gathering in Bern.

Abbreviated YDB evidence at 2011 Bern, Switzerland, INQUA Conference

6 Responses

  1. Ahem … one still has to distinguish and/or eliminate the possibility that these carbon nanoparticles are not the result of ordinary wildfires, such as these described in this paper :

    New insight into the soot nanoparticles in a candle flame

  2. abstracts available for INQUA Session 60 The enigmatic Younger Dryas climatic episode, July 2011 Bern, Switzerland: Rich Murray 2011.09.07


    Abstract Details
    ID: 1813
    Title: Unusual material in early Younger Dryas age sediments and their potential relevance to the YD Cosmic Impact Hypothesis
    Session: 60 The enigmatic Younger Dryas climatic episode
    Authors: Malcolm LeCompte
    Albert Goodyear
    Mark Demitroff
    Dale Batchelor
    Edward Vogel
    Charles Mooney
    Barry Rock
    Presenter: Malcolm LeCompte
    Type: oral


    The cause of the abrupt Younger Dryas (YD) climate change with its North American megafauna extinctions, population bottlenecks, and cultural disappearance remains enigmatic.
    Iron- and silica-rich magnetic spherules reported from Younger Dryas Boundary (YDB) sediments and dated to the stadial’s onset were interpreted by some as cosmic impact relicts.
    They interpreted Northern Hemisphere YDB spherules as either impact ablation accumulations or ejecta.
    Others, claiming adherence to the same protocol, reported an inability to find spherule enhancement in YDB strata.

    We review spherule identification and counting methodology of two opposing studies.
    An independent blind-test examination was conducted using samples from two pre-YD occupation sites common to both studies: Blackwater Draw, NM, and Topper, SC.
    At Topper, samples were taken from sediments located above, adjacent to, and at the Clovis artifact debitage layer.
    Absence of overlying debitage indicates a multi-century hiatus in human activity before successor culture reoccupation.
    We found increased spherule abundance in YDB strata at both common sites.
    We also report spherules present in YD-age sediment from Paw-Paw Cove, MD, contrary to its reported absence.
    Spherule geochemistry reflects similar iron, titanium, aluminosilicate, oxygen, and carbon content at three widely separated sites.
    Spherules with elevated concentrations of rare earth elements including Cerium, Lanthanum, and Praseodymium are occasionally detected.
    Our spherule positive results are consistent with the YD Cosmic Impact Hypothesis study that found similar spherule composition and increased abundances in YDB sediments.

    Earlier negative results appear due to non-adherence of grain-size sorting protocol and subsequent examination of smaller than recommended aliquots.
    Size sorting mitigates neurocognitive factors making optical microspherule searches much less labor intensive.


    ID: 3134
    Title: Carolina Bays: Younger Dryas Time Capsules
    Session: 60 The enigmatic Younger Dryas climatic episode
    Authors: Malcolm LeCompte
    Kiara Jones
    LaEsha Barnes
    Ryan Lawrence
    Cedric Hall
    MyAsia Reid
    Devina Hughes
    Leroy Lucas
    Mark Demitroff
    David Kimbel
    Presenter: Malcolm LeCompte
    Type: poster


    Cold, dry, windy conditions prevailed far south of the Laurentide Ice Sheet during glacial epochs.
    A half-million, similarly aligned, elliptically shaped, shallow depressions or Carolina Bays are artifacts of potent Pleistocene geomorphic forces.
    We assume Bay formation by strong late Pleistocene winds deflating loose sandy sediments to create hollows or blowouts.
    Episodic modification continued into the early Holocene when dry, windy periods alternated with wet, calm periods.
    Windblown and water-borne sediments repeatedly filled Bay bottoms.
    Their fill became a layered repository of transported material; time capsules for post LGM history.
    OSL, 14C dating, pollen analysis, and cultural assemblages have been used to date Bays.
    Rockyhock, Chowan County, NC and Kimbel, Cumberland County, NC, provide an opportunity to examine Younger Dryas paleoenvironmental conditions and test the Younger Dryas Impact hypothesis.
    Both Bays were surveyed using Ground Penetrating RADAR to evaluate subsurface structure.
    Sediment composition differs between Bays;
    Rockyhock contains fluvial sediments, while Kimbel is primarily aeolian fill.
    Kimbel Bay’s windblown sediments contain significant quantities of potential impact markers including: nanodiamonds, carbon spherules, glasslike carbon, charcoal, and magnetic spherules.
    Their exact chronostratigraphic significance remains undetermined.
    Rockyhock Bay’s fluvial sediments contain only a very few magnetic spherules in rim sediments.
    Carbon spherules, glasslike carbon, and charcoal were not found with analysis of bay center samples pending.
    A relationship is probable between wind action and impact marker abundance.
    Marker concentration may be enhanced by complex size segregation dynamics during eolian activity.
    Bay floors with bounding surfaces could be described as traps that collected otherwise rare and widely scattered soil constituents.


    Malcolm A. LeCompte
    Campus Box 672 ECSU, Elizabeth City, North Carolina 27909
    (252)267-1743 cell
    (252)335-3807 office
    Email options:
    [email protected], [email protected], [email protected]


    [ Put the ID number in place of 1813 or 3134 to get other abstracts ]

    Abstracts for Session 60 “The enigmatic Younger Dryas climatic episode”
    Oral Presentations July 20-27, 2011 INQUA Conference, Bern, Switzerland

    ID Title Presenter Talknbr. Invited
    1666 Younger Dryas Onset Marked by Dramatic Environmental and Biotic Change James Kennett 1 x
    835 The Younger-Dryas Cold reversal: Ice-Earth-Ocean Intercations During a Period of Rapid Climate Change Richard Peltier 2 x
    366 Assessing the effectiveness of different freshwater drainage routes at triggering the Younger Dryas Alan Condron 3
    2964 Reduced Atlantic Meridional Overturning Circulation (AMOC) and Regional Climate Change During the Younger Dryas Jerry McManus 4 x
    3138 Oceanic Variability in the Gulf of Alaska during the Younger Dryas Summer K. Praetorius 5
    1514 Abrupt changes in runoff from North America during the Younger Dryas James Teller 6 x
    262 Younger Dryas glaciation of Scandinavia – the type area for the Younger Dryas Jan Mangerud 7 x
    1813 Unusual material in early Younger Dryas age sediments and their potential relevance to the YD Cosmic Impact Hypothesis Malcolm LeCompte 8 x
    2641 Exceptional iridium concentrations found at the Allerød-Younger Dryas transition in sediments from Bodmin Moor in southwest England William Marshall 9
    1556 Nanodiamonds and the Usselo layer Annelies van Hoesel 10
    2768 Vegetation change and the Younger Dryas: a continental-scale perspective Matthew Peros 11 x
    209 The Younger Dryas in the Neotropics: paleoecological evidence from Venezuela Encarni Montoya 12 x


    ID Title Presenter

    583 New paleoclimatic reconstruction for the Allerød and Young Dryas of the plain part of Ukraine (based on palynological data) Lyudmila Bezusko
    997 Vegetation dynamics during Younger Dryas climatic episode (12600 – 11500 yr. cal. B.P.) in Northwest Lithuania Eugenija Rudnickaite
    1177 Effective moisture during the late glacial to Holocene transition from mainland eastern Australia John Tibby
    1181 The boundary phenomenon of the Pleistocene – Holocene in the Baikal Siberia (Russia) Natalia Berdnikova
    1184 A review on the radiocarbon and absolute chronologies bracketing the Younger Dryas climatic event Edouard Bard
    1294 Individual and community responses of diatoms to the Younger Dryas climatic reversal in a South Carpathian glacial lake Krisztina Buczkó
    1378 North Atlantic reservoir ages linked to high Younger Dryas atmospheric radiocarbon concentrations William Austin
    1447 The Bull Creek valley stream terraces, buried soils, and paleo-environment during the Younger Dryas in the Oklahoma Panhandle, USA Alexander Simms
    1526 Soot as Evidence for Widespread Fires at the Younger Dryas Onset (YDB, 12.9 ka) James Kennett
    1584 Human Population Decline across Parts of the Northern Hemisphere during the Younger Dryas Cooling Period James Kennett
    1587 Eastward Drainage of Glacial Lake Agassiz: The Perspective from the Lake Superior Basin Steve M. Colman
    1591 Nanodiamonds as Evidence for a Younger Dryas Cosmic Impact Event Allen West
    1606 Shock-melt Evidence for a Cosmic Impact with Earth during the Younger Dryas at 12.9 ka Allen West
    1619 Evidence for Widespread Biomass-Burning at the Younger Dryas Boundary at 12.9 ka Allen West
    2667 Greater-than-present wet conditions from 14.6 to 10.2 cal ka yr BP in the southwestern Great Lakes area, North America Brandon Curry
    2765 Evidence of Younger Dryas aridity in dune-paleosol successions in the Midwest of U.S.A. Hong Wang
    2853 Pedogenic Climate Signals in the Great Plains (USA) during the Pleistocene-Holocene Transition (Bølling/Allerød – Boreal) William C Johnson
    2875 The Allerød-Younger Dryas Transition in lake sediments from The Netherlands Wim Hoek
    3116 Megafaunal Extinction at the Younger Dryas Onset in North America Douglas Kennett
    3134 Carolina Bays: Younger Dryas Time Capsules Malcolm LeCompte

  3. Rich –

    Pierson never makes YD timing claims for possible geoblemes, and is careful to keep possible geoblemes sepaate from confirmed geoblemes. Pierson also never makes wild claims about possible geoblemes without checking other possibilities first.

    TLE –

    The mechanics of the production of different carbon forms is pretty well known by all of those involved.

  4. Then I direct you to this recent result :

    Three-Stage Transformation Pathway from Nanodiamonds to Fullerenes, Anastassia Sorkin, Bengkang Tay and Haibin Su,
    J. Phys. Chem. A, 2011, 115 (30), pp 8327–8334, June 25, 2011

    The problem remains, are the observed nanodiamonds and carbon nanoparticles ubiquitous or unique? Interesting question.

  5. Hi TLE –

    Its not “unique” – its concentrations. See Napier’s note on the Taglish Lake meteorite here.
    One problem is those

  6. Hi TLE –

    Keyboard problem there.

    One major problem in impact research is beginners without background or skills starting in – for example, archaeologists trying to do geological sampling and processing.

    I try to limit myself to ethnographic studies but will extend as necessary; I spent years learning from others.

    A good place for you to start would be with the Cambridge Conference archives and Bob Kobres’ pages.

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