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 published results. [1] Authors have not yet responded to requests for clarification and have never made their raw data available. [4]

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 correlation and dating of the North American late Pleistocene.

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 for intense wildfire . It often occurs immediately beneath an organic-rich layer reported in unconsolidated terrestrial deposits across North America ( 3 ).

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 containing in situ mammal bones and Clovis artifacts.”

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 iridium intermixed with temporally diagnostic Clovis artifacts.

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 by Kaiser et al. (2009). However, they attributed this charcoal-laden stratigraphic boundary to non-impact causes essentially on the basis of a wide spread of individual ...

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 widespread YDB Pt anomaly is...

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 western Canada .

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 unusual, titanium-rich projectile-like ejecta further away.

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 impact site and unusual, titanium-rich projectile-like ejecta further away.