Lockne crater
Template:Short description Template:Infobox terrestrial impact site Lockne is a meteorite crater, located approximately Template:Convert south of the city of Östersund in northern Sweden.<ref name=eid>Template:Cite web</ref> It has been suggested that it is a doublet with the nearby smaller Målingen Crater, Template:Convert apart.<ref name=Rincon>Raul Rincon (2014) BBC News: "Ancient Earth hammered by double space impact", 18 March 2014: accessed 19 March 2014.</ref> Computer simulations suggest that the asteroid that created the Lockne crater was some Template:Convert in diameter, and the one that carved out Målingen crater was about Template:Convert across.<ref name=Rincon/>
It is Template:Convert in diameter and the age is estimated, based on accompanying chitinozoan microfossils, to be 458 million years (Late Ordovician).<ref name=eid/> The crater is exposed at the surface. Its fossils, typical of shallow marine environments, show it to be a marine target impact event.