Comment on “The Younger Dryas impact hypothesis: A review of the evidence”, by Martin B. Sweatman (2021), Earth-Science Reviews 218, 103677

2021 ◽  
pp. 103892
Author(s):  
Ian A. Jorgeson ◽  
Ryan P. Breslawski ◽  
Abigail E. Fisher
Keyword(s):  
Earth Science ◽  
Younger Dryas ◽  
Impact Hypothesis

Introduction

2018 ◽  
pp. 1-7
Author(s):  
Albert C. Goodyear ◽  
Christopher R. Moore
Keyword(s):  
Sea Level ◽  
Late Pleistocene ◽  
Coastal Plain ◽  
Younger Dryas ◽  
Archaeological Sites ◽  
Impact Hypothesis

This chapter reviews the significant features of early prehistoric occupations of the Southeastern U.S. Coastal Plain. Along with the Pleistocene age archaeological sites, salient aspects of the geology, including sea level positions, are presented. Possible Pre-Clovis sites dating from pre-LGM to late Pleistocene times are considered. Clovis is seen to have a Coastal Plain settlement focus that includes the now-drowned shelf. The dramatic onset of the Younger Dryas and its potential effects on people, including the “Younger Dryas Impact Hypothesis,” are reviewed.

scholarly journals Independent evaluation of conflicting microspherule results from different investigations of the Younger Dryas impact hypothesis

2012 ◽  
Vol 109 (44) ◽  
pp. E2960-E2969 ◽  
Author(s):  
M. A. LeCompte ◽  
A. C. Goodyear ◽  
M. N. Demitroff ◽  
D. Batchelor ◽  
E. K. Vogel ◽  
...  
Keyword(s):  
Younger Dryas ◽  
Independent Evaluation ◽  
Impact Hypothesis

Environmental and biotic change at the nanodiamond datum: The Younger Dryas boundary impact hypothesis

2013 ◽  
Vol 310 ◽  
pp. 234
Author(s):  
James Kennett ◽  
Allen West ◽  
Douglas Kennett ◽  
Charles Kinzie ◽  
Wendy Wolbach
Keyword(s):  
Younger Dryas ◽  
Biotic Change ◽  
Impact Hypothesis

scholarly journals Bayesian chronological analyses consistent with synchronous age of 12,835–12,735 Cal B.P. for Younger Dryas boundary on four continents

2015 ◽  
Vol 112 (32) ◽  
pp. E4344-E4353 ◽  
Author(s):  
James P. Kennett ◽  
Douglas J. Kennett ◽  
Brendan J. Culleton ◽  
J. Emili Aura Tortosa ◽  
James L. Bischoff ◽  
...  
Keyword(s):  
Statistical Tests ◽  
Younger Dryas ◽  
Greenland Ice Sheet ◽  
Causal Connection ◽  
Impact Event ◽  
Widespread Distribution ◽  
Proxy Records ◽  
Melt Glass ◽  
Age Range ◽  
Impact Hypothesis

The Younger Dryas impact hypothesis posits that a cosmic impact across much of the Northern Hemisphere deposited the Younger Dryas boundary (YDB) layer, containing peak abundances in a variable assemblage of proxies, including magnetic and glassy impact-related spherules, high-temperature minerals and melt glass, nanodiamonds, carbon spherules, aciniform carbon, platinum, and osmium. Bayesian chronological modeling was applied to 354 dates from 23 stratigraphic sections in 12 countries on four continents to establish a modeled YDB age range for this event of 12,835–12,735 Cal B.P. at 95% probability. This range overlaps that of a peak in extraterrestrial platinum in the Greenland Ice Sheet and of the earliest age of the Younger Dryas climate episode in six proxy records, suggesting a causal connection between the YDB impact event and the Younger Dryas. Two statistical tests indicate that both modeled and unmodeled ages in the 30 records are consistent with synchronous deposition of the YDB layer within the limits of dating uncertainty (∼100 y). The widespread distribution of the YDB layer suggests that it may serve as a datum layer.

scholarly journals Reply to Holliday and Boslough et al.: Synchroneity of widespread Bayesian-modeled ages supports Younger Dryas impact hypothesis

2015 ◽  
Vol 112 (49) ◽  
pp. E6723-E6724 ◽  
Author(s):  
James P. Kennett ◽  
Douglas J. Kennett ◽  
Brendan J. Culleton ◽  
J. Emili Aura Tortosa ◽  
Ted E. Bunch ◽  
...  
Keyword(s):  
Younger Dryas ◽  
Impact Hypothesis

Potential Consequences of the YDB Cosmic Impact at 12.8 kya

2018 ◽  
pp. 175-192 ◽  
Author(s):  
James P. Kennett ◽  
Douglas J. Kennett ◽  
Malcolm A. LeCompte ◽  
Allen West
Keyword(s):  
Northern Hemisphere ◽  
Explanatory Power ◽  
Younger Dryas ◽  
Cultural Changes ◽  
Impact Hypothesis

The Younger Dryas cooling episode came about in the Northern Hemisphere in an abrupt manner atypical of deglaciation events. This cooling resulted in the Pleistocene extinctions of many genera of faunas and coincided with the disappearance of the Clovis culture. The Younger Dryas Cosmic Impact of 12.8 kya is then considered as a hypothesis that explains these dramatic and enigmatic events. As a nonlinear climate episode, the YDB Impact Hypothesis can have explanatory power in accounting for the associated environmental and cultural changes.

The Younger Dryas impact hypothesis: A requiem

2011 ◽  
Vol 106 (3-4) ◽  
pp. 247-264 ◽  
Author(s):  
Nicholas Pinter ◽  
Andrew C. Scott ◽  
Tyrone L. Daulton ◽  
Andrew Podoll ◽  
Christian Koeberl ◽  
...  
Keyword(s):  
Younger Dryas ◽  
Impact Hypothesis
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