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>At Tanis, unlike any other known Lagerstätte site, it appears freak circumstances allowed for the preservation of exquisite, moment-by-moment details caused by the impact event. These include many rare and unique finds, which allow unprecedented examination of the direct effects of the impact on plants and animals alive at the time of the large bolide impact some 3,000 kilometers (1,900 mi) distant. The events at Tanis occurred far too soon after impact to be caused by the megatsunamis expected from any large impact near large bodies of water. Instead, much faster seismic waves from the massive magnitude 10 – 11.5 earthquakes:p.8 probably reached the Hell Creek area as soon as ten minutes after the impact, creating seiche waves between 10–100 metres (33–328 ft) high in the Western Interior Seaway :p.8 and perhaps in other waters nearer Tanis, which was near an ancient river. These waves carried sea, land, freshwater animals and plants, and other debris several miles inland. The seiche waves exposed and covered the site twice, as millions of tiny droplets and debris from the impact were arriving on ballistic trajectories from their source in what is now the Yucatán Peninsula.
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