Early Solar System Impact Bombardment III (2015) sess201.pdf Wednesday, February 4, 2015 POSTER SESSION: EARLY SOLAR SYSTEM BOMBARDMENT 5:30 p.m. Great Room Schmedemann N. Kneissl T. Neesemann A. Michael G. Hiesinger H. Jaumann R. Raymond C. A. Russell C. T. The Age of the Rheasilvia Basin — How the two Geological Interpretations and Chronology Systems Differ [#3006] We review and analyze the major disagreements in the formation age of the Rheasilvia basin on Vesta that were published recently. Davis C. L. Moser D. E. U-Pb Composition and Shock Microstructures of In-Situ Accessory Phases Across the Vredefort Impact Structure, South Africa: A Terrestrial Analogue for Dating the Lunar Surface and Other Planetary Bodies [#3028] Accessory phases (i.e. zircon, monazite) co-exist within individual samples of the Vredefort dome, with a dichotomy of U-Pb ages and microstructural evolution. Vredefort is a terrestrial analogue for complex craters on other planetary bodies. Righter K. Cosca M. A. 40 Ar/39Ar Age of Hornblende-Bearing R Chondrite LAP 04840 [#3022] This unsual meteorite yields an Ar-Ar age of 4.29 Ga — evidence for post shock annealing in the R chondrite parent body.
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