The Rock Elm Disturbance may not look like much now. It's very old. But this crater was formed when a rock 170 meters across slammed into the dirt at 40,000 kilometers per hour or more. (1/n)pic.twitter.com/fXGqjkg4QT
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The Rock Elm Disturbance happened about 467 million years ago, in what's now Wisconsin. It's part of a *line* of craters that were formed at nearly the same time... part of the Ordovician Meteor Event. (The continents didn't look like this back then.) (2/n)pic.twitter.com/fS2VGPhktM
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huh .. I’m trying to think of a mechanism .. maybe a pancake-like asterioid that entered the atmosphere just right and broke up upon entry? [ strokes chin in proverbial armchair ]
