Allen West found a paper by Rick Firestone and Bill Topping about dust-sized spherules across the U.S. Retired NASA scientist Ted Bunch, who'd helped discover the Chicxulub impactor, found them unusual. Dr. Wendy Wolbach then identified extreme high-temperature soot in the Younger Dryas Boundary — identical to KPG boundary material and absent elsewhere.
Discovery of Younger Dryas Boundary spherules leads to Comet Research Group
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Key facts
- Allen West discovered a paper by Rick Firestone and Bill Topping documenting a layer of spherules first found in Michigan and then in the western United States.
- Ted Bunch, a retired NASA scientist who worked on moon rocks and helped the Alvarez team discover the KPG (Chicxulub) impactor, analyzed the spherules and concluded they were unusual.
- Dr. Wendy Wolbach found extreme high-temperature soot in the Younger Dryas Boundary (YDB) layer identical to that in the KPG boundary layer, with no similar material above or below it.
- The spherules are the size of a grain of dust and resemble ball bearings.
Site mentioned
Sources
Evidence for an extraterrestrial impact 12900 years ago ... - PubMedpubmed.ncbi.nlm.nih.gov
Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling · Authors.
no Younger Dryas extra-terrestrial impact 12.9 ka? - AAT@groups.iogroups.io
An independent evaluation of the Younger Dryas extraterrestrial impact hypothesis. TA Surovell cs 2009 PNAS 106:18155-8
Evidence for an extraterrestrial impact 12,900 years ago that ...pure.psu.edu
Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling · Overview ...
Evidence for an extraterrestrial impact 12,900 years ago that ... - PNASpnas.org
Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling. R. B. Firestone ...
Analysis of the Younger Dryas Impact Layer - UNT Digital Librarydigital.library.unt.edu
We have uncovered a thin layer of magnetic grains and microspherules, carbon spherules, and glass-like carbon at nine sites across North America, ...
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