MANSON IMPACT STRUCTURE
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PHOTOMICROGRAPH Crystalline Basement Rocks Impact-Shocked Quartz Grain
2-A Core--646 feet
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Fine, dark lines are planar deformation features (multiple intersecting sets of these features as seen here are considered definitive evidence of impact origin). Broader, irregular dark lines are conjugate fracture sets. The brown mottling is "toasting," common to shocked quartz at Manson. --field 3.2 x 2.1 mm |
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