geo 13 - A NEWLY RECOGNIZED LATE ARCHEAN IMPACT SPHERULE...

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A NEWLY RECOGNIZED LATE ARCHEAN IMPACT SPHERULE LAYER IN THE REIVILO FORMATION, GRIQUALAND WEST BASIN, SOUTH AFRICA. B. M. Simonson 1 and D. Y. Sumer 2 , 1 Geology Dept., Oberlin College, Oberlin, OH 44074 ([email protected]), 2 Geology, University of California, Davis, Davis, CA 95616 ([email protected]). Introduction: Spherule layers, particularly those hosted by deeper-water Precambrian successions, are emerging as important sources of information on large terrestrial impacts [1-3]. Searches in the late Archean to early Paleoproterozoic Hamersley basin of Western Australia have been especially fruitful as spherule layers from a minimum of 3 large impacts have already been found [4]. Strata of comparable age and deposited in similar environments are preserved over large areas in the Transvaal Supergroup of South Africa. An initial search resulted in the discovery of a late Archean layer in the Griqualand West basin hosted by the Monteville Formation of the Campbellrand Subgroup [5]. Here we report the discovery of a second late Archean spherule layer 250 to 300 m
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