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Evidence for an extraterrestrial impact 12,900 years ago that contributed to the megafaunal extinctions and the Younger Dryas cooling
It is proposed that one or more large, low-density ET objects exploded over northern North America, partially destabilizing the Laurentide Ice Sheet and triggering YD cooling, which contributed to end-Pleistocene megafaunal extinctions and adaptive shifts among PaleoAmericans in North America. Expand
Impact Event at the Permian-Triassic Boundary: Evidence from Extraterrestrial Noble Gases in Fullerenes
Fullerenes from sediments at the PTB contain trapped helium and argon with isotope ratios similar to the planetary component of carbonaceous chondrites, implying that an impact event accompanied the extinction, as was the case for the Cretaceous-Tertiary extinction event about 65 million years ago. Expand
The Organic Content of the Tagish Lake Meteorite
Analysis of the Tagish Lake meteorite has shown this carbonaceous chondrite to contain a suite of soluble organic compounds that provides insight into an outcome of early solar chemical evolution that differs from any seen so far in meteorites. Expand
Bedout: A Possible End-Permian Impact Crater Offshore of Northwestern Australia
The Bedout High, located on the northwestern continental margin of Australia, has emerged as a prime candidate for an end-Permian impact structure and the identification of melt rocks and impact breccias from drill cores located on top of Bedout are consistent with the presence of a buried impact crater. Expand
Chondritic Meteorite Fragments Associated with the Permian-Triassic Boundary in Antarctica
In one sample, the meteoritic fragments are accompanied by more abundant discrete metal grains, which are also found in an end-Permian bed at Meishan, southern China, and the implications for a suggested global impact event at the Permian-Triassic boundary are discussed. Expand
Astrophysical and astrochemical insights into the origin of life
Stellar nucleosynthesis of heavy elements such as carbon allowed the formation of organic molecules in space, which appear to be widespread in our Galaxy. The physical and chemicalExpand
New insights into deformation and fluid flow processes in the Nankai Trough accretionary prism: Results of Ocean Drilling Program Leg 190
Moore, G. F., Taira, A., Klaus, A., Becker, L., Boeckel, B., Cragg, B. A., Dean, A., Fergusson, C. L., Henry, P., Hirano, S., Hisamitsu, T. et al. (2001). New insights into deformation and fluid flowExpand
Extraterrestrial Helium Trapped in Fullerenes in the Sudbury Impact Structure
The 3He/4He ratios in the Sudbury fullerenes are similar to those found in meteorites and in some interplanetary dust particles, suggesting that the helium within the C60 molecules at Sudbury is of extraterrestrial origin. Expand
Fullerenes in the 1.85-billion-year-old Sudbury impact structure.
The oxidation of the fullerenes during the 1.85 billion years of exposure was apparently prevented by the presence of sulfur in the form of sulfide-silicate complexes associated with the fulrerenes. Expand
A search for endogenous amino acids in martian meteorite ALH84001.
The amino acids present in this sample of ALH84001 appear to be terrestrial in origin and similar to those in Allan Hills ice, although the possibility cannot be ruled out that minute amounts of some amino acids such as D-alanine are preserved in the meteorite. Expand