Younger Dryas impact hypothesis - Wikipedia
In 2007, the first YDIH paper [8] speculated that a comet airburst over North America created a Younger Dryas boundary (YDB) layer; however, inconsistencies have been identified in other …
Evidence for an extraterrestrial impact 12,900 years ago that ... - PNAS
2007年10月9日 · The unique, carbon-rich, YDB layer, coupled with a distinct assemblage of impact tracers, implies isochroneity of the YDB datum layer and thus highlights its utility for …
Nanodiamonds in the Younger Dryas Boundary Sediment Layer | Science …
2009年1月2日 · The YD boundary (YDB) is a distinctive layer containing above-background amounts of magnetic microspherules, iridium, and other impact proxies found with evidence …
A Blind Test of the Younger Dryas Impact Hypothesis - PMC
According to Firestone et al (Supp Data) the YDB is a “layer of fine-grained fluvial or lacustrine sediment that lies at the base of the black mat in the uppermost stratigraphic horizon …
Bayesian chronological analyses consistent with synchronous age ... - PNAS
2015年7月27日 · The YDB layer is a 5-cm-thick interval at a depth of 57.5–62.5 cmbs, exhibiting peaks in impact-related spherules, carbon spherules, nanodiamonds, nickel, chromium, and …
The Younger Dryas impact hypothesis: Review of the impact …
2021年7月1日 · Nevertheless, a conspicuous layer of charcoal within the Ussello horizon that spans north west Europe, often considered to be an extension of the YDB, was later confirmed …
Widespread platinum anomaly documented at the Younger Dryas …
2017年3月9日 · We document discovery of a distinct Pt anomaly spread widely across North America and dating to the Younger Dryas (YD) onset. The apparent synchroneity of this …
Reply to Ives and Froese: Regarding the impact-related Younger ... - PNAS
2013年10月4日 · Ives and Froese challenge the identification of the Chobot black mat layer at the Younger Dryas (YD) boundary (YDB), claiming that no black mats have been documented in …
Analysis of the Younger Dryas Impact Layer - eScholarship
The distribution pattern of the Younger Dryas boundary (YDB) ejecta layer is consistent with an impact near the Great Lakes that deposited terrestrial-like ejecta near the impact site and …
Analysis of the Younger Dryas Impact Layer - OSTI.GOV
2010年2月27日 · The distribution pattern of the Younger Dryas boundary (YDB) ejecta layer is consistent with an impact near the Great Lakes that deposited terrestrial-like ejecta near the …