Meteorite Impact!: The Danger from Space and South Africa's Mega-impact : the Vredefort Structure |
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Anglo-Boer Archaean Askoppies asteroids Boer bolide breccia Bushveld Bushveld Complex caused central centre Chicxulub collar comet contains core crater structures crust crystals deformation deposited early Earth earthquake explosion farm Figure formation formed fractures fragments Gatsrand geological geologists geophysical gold granitic Granophyre Group hill impact craters impact event impact origin impact structure impact-melt rock Iron Age Johannesburg Kaapvaal craton kilometres km diameter large number lava layers leaves located Lunar magmatic material melt Meteor Crater meteorite meteorite impact mineral mining Moon occur Ocean orbits Parys planet Potchefstroom Pretoria projectile pseudotachylitic pseudotachylitic breccia quarry quartz quartzite region result ridges road rock types samples sediment sedimentary settlement shatter cones shock metamorphism so-called Solar System South Africa species Stone Age subsp surface tectonic town Tswaing Tswaing Crater Uwe Reimold Vaal River Ventersdorp Venterskroon volcanic Vredefort Dome VREDEFORT DOME AREA Vredefort Mountain Land Vredefort Structure Witwatersrand basin zeyheri zone