[meteorite-list] abstracts available for INQUA Session 60 The enigmatic Younger Dryas climatic episode, July 2011 Bern, Switzerland -- two by Malcolm LeCompte: Rich Murray 2011.09.13
From: Rich Murray <rmforall_at_meteoritecentral.com>
Date: Tue, 13 Sep 2011 22:43:55 -0700 Message-ID: <CAHqJ8pYzAOKyGWFcFFteHVA5xJpEixjqqS_tocc9zd+o3tPKuQ_at_mail.gmail.com> abstracts available for INQUA Session 60 The enigmatic Younger Dryas climatic episode, July 2011 Bern, Switzerland -- two by Malcolm LeCompte: Rich Murray 2011.09.13 http://rmforall.blogspot.com/2011/09/abstracts-available-for-inqua-session.html http://www.inqua2011.ch/?a=programme&subnavi=abstract&id=1813&sessionid=60 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 Content: 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. http://www.inqua2011.ch/?a=programme&subnavi=abstract&id=3134&sessionid=60 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 Content: 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. http://nia.ecsu.edu/sp/staff/lecompte/cv.html Malcolm A. LeCompte Campus Box 672 ECSU, Elizabeth City, North Carolina 27909 (252)267-1743 cell (252)335-3807 office Email options: lecomptem at mail.ecsu.edu, malecompte at aol.com, mlecompte at astrovision.com http://cosmictusk.com/upcoming-bern-inqua-conference-packed-with-younger-dryas-boundary-studies [ 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 Aller?d-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 Posters ID Title Presenter 583 New paleoclimatic reconstruction for the Aller?d 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 Buczk? 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 (B?lling/Aller?d ? Boreal) William C Johnson 2875 The Aller?d-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 10 m broken rock hill with black glazes, W of Rancho Alegre Road, S of Coyote Trail, W of Hwy 14, S of Santa Fe, New Mexico, tour of 50 photos 1 MB size each via DropBox: Rich Murray 2011.07.28 2011.08.03 http://rmforall.blogspot.com/2011/08/10-m-broken-rock-hill-with-black-glazes.html http://rmforall.blogspot.com/2011/08/35479730-106085926-1865-km-el-top-10-m.html photos 3-5 of 50 http://tech.groups.yahoo.com/group/astrodeep/message/92 vast geoablation in Argentina, craters from SW to NE -- Cox re Boslough bursts: Rich Murray 2011.07.31 http://rmforall.blogspot.com/2011/07/vast-geoablation-in-argentina-craters.html http://tech.groups.yahoo.com/group/astrodeep/message/91 unique erratic 3 m rock, complex mixed composition, and many possibly related airburst features W of Vaughn, New Mexico: Dennis Cox: Rich Murray 2010.11.26 http://rmforall.blogspot.com/2010/11/unique-erratic-3-m-rock-complex-mixed.html http://tech.groups.yahoo.com/group/astrodeep/message/78 http://rmforall.blogspot.com/2010/11/blog-post_27.html 12 photos of 3 m erratic rock 09-NOV-10 11:10:48 WP128 3 m rock, 34.600080 -105.342566 1.900 km el, just S of SR 60 US 285, 8 km W of SR 54, 15 km W of Vaughn, NM, 57 km E of Laguna Del Perro impact field, unique erratic 3 m rock, complex mixed composition. Pierson Barretto gives best amateur site for worldwide evidence for Holocene impacts: Rich Murray 2011.09.06 http://rmforall.blogspot.com/2011/09/pierson-barretto-gives-best-amateur.html Pierson Barretto, a retired architech and long-time amateur astronomer in Brazil, has completely surpassed Dennis Cox, Rich Murray, Michael Davias, and other amateurs for the most convincing, detailed, and dramatic introduction to worldwide evidence for Holocene impacts. https://sites.google.com/site/cosmopier/ IMPACT CRATER Scars and Palaeolagoons Under Continuous Construction This site is dedicated to a new approach on solar system astrophysics, archaeology, paleontology, archaeoastronomy, climate studies, water resources and environmental evolution from the End-Pleistocene and Holocene. The site shares some clues about craters, scars, palaeolagoons and their possible cosmic origin... www.cosmictusk.com blog for all point of view, now sharing major progress re mainstream research within mutual service, Rich Murray Rich Murray, MA Boston University Graduate School 1967 psychology, BS MIT 1964, history and physics, 1943 Otowi Road, Santa Fe, New Mexico 87505 rmforall at gmail.com 505-819-7388 Skype audio, video rich.murray11 http://RMForAll.blogspot.com new primary archive http://tech.groups.yahoo.com/group/AstroDeep/messages http://health.groups.yahoo.com/group/aspartameNM/messages group with 118 members, 1,625 posts in a public archive http://groups.yahoo.com/group/rmforall/messages ______________________________________________ Received on Wed 14 Sep 2011 01:43:55 AM PDT |
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