— — the scar the sky left two billion years ago.
“An asteroid struck here when the continents had not yet finished arranging themselves. What remains is not a bowl but a wide, soft ring of hills around the small town of Parys, with the Vaal River bending through the centre. Farmers work the land. A few rough roads cross the dome. The whole thing is too large to see from the ground; you read it on a map and feel the floor shift a little. from the studio
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The Vredefort structure sits on the South African high veld around the town of Parys, roughly 120 kilometres southwest of Johannesburg, straddling the Free State and North West provinces. It is the eroded root of what was once an impact crater on the order of 300 kilometres across, the largest verified on Earth. The Vaal River cuts the central dome. UNESCO inscribed the site as a World Heritage property in 2005 for its geological record of one of the oldest and largest meteorite impacts ever identified.
The dome is what's left after two billion years of weather lifted the floor of the crater into view. Geologists read the event in shocked quartz, pseudotachylite veins, and shatter cones in the granite — small radiating fans in the rock that only form under the pressure of an impact. The Witwatersrand strata around the ring also hold the gold reefs that built Johannesburg. The science here is unusually legible: you can walk a field outcrop and put a hand on the moment.
The impact is dated to roughly 2.02 billion years ago, in the Paleoproterozoic, long before complex life. Most craters that old have been erased by tectonics; Vredefort survived because the South African craton has been quietly stable for most of that time. The river-side town of Parys grew up around it in the late nineteenth century, and weekenders from Johannesburg now drive down for the Vaal, the rafting, and the slow loop through farm country that follows the curve of the ring.