From mid-Ordovician ∼470 Myr-old limestone >100 fossil L-chondritic meteorites have been recovered, representing the markedly enhanced flux of meteorites to Earth following the breakup of the L-chondrite parent body. Recently one anomalous meteorite, Österplana 065 (Öst 65), was found in the same beds that yield L chondrites. The cosmic-ray exposure age of Öst 65 shows that it may be a fragment...

Written by David W. Mittlefehldt NASA, Johnson Space Center Pieces of a 56-metric-ton meteorite rained down over a wide area of Canada on January 18, 2000. Many pieces landed on the frozen Tagish Lake, allowing scientists to recover numerous samples, and giving the meteorite its name. Studies show that the meteorite is intermediate in composition between the two most primitive groups of chondri...

The cause of the end-Cretaceous (KPg) mass extinction is still debated due to difficulty separating the influences of two closely timed potential causal events: eruption of the Deccan Traps volcanic province and impact of the Chicxulub meteorite. Here we combine published extinction patterns with a new clumped isotope temperature record from a hiatus-free, expanded KPg boundary section from Sey...

The Kaidun meteorite, which fell on 3.12.1980 at lat. 15° N, long. 48.3° E, holds a special place in the world meteorite collection. Kaidun is characterized by an unprecedentedly wide variety of meteorite material in its makeup. The high degree of variability in this meteorite’s material is evidenced by the richness of its mineral composition – nearly 60 minerals and mineral phases have been id...

High temperature impact melt breccias from the Rochechouart (France) meteorite crater record a magnetization component with antipodal, normal and reverse polarities. The corresponding paleomagnetic pole for this component lies between the 220 Ma and 210 Ma reference poles on the Eurasian apparent polar wander path, consistent with the 214±8 Ma Ar/Ar age of the crater. Late Triassic tectonic rec...

available online at http://meteoritics.org 1249 © The Meteoritical Society, 2006. Printed in USA. Microbial diversity on the Tatahouine meteorite Karim BENZERARA1*, Virginie CHAPON2, David MOREIRA3, Purificación LÓPEZ-GARCÍA3, François GUYOT1, and Thierry HEULIN2 1Laboratoire de Minéralogie-Cristallographie, UMR 7590 and Institut de Physique du Globe de Paris, 4 place Jussieu, 75252 Paris Cedex...

In addition to the four grain size fractions of diamonds separated from the Efremovka (CV3) meteorite reported earlier [1], six more diamond size-fractions from the same meteorite have been generated with sizes both coarser and finer than the original set. Isotope analyses of C, N and noble gases in the new fractions confirmed most of the trends observed earlier for concentrations and isotopic ...