article_snippet: Upon analysing new samples at the site, new samples found a maximum age of 460 million years, far older than the West Clearwater Lake, which is 285 million years old. '
article_snippet: the researchers think that the accurate age for the East Clearwater crater was, in fact, already measured back in 1990,' said geologist and lead author Dr Martin Schmieder of the university.
highlights_snippet: The Clearwater Lakes were thought to have both formed 285m years ago .
  
highlights_snippet: But analysis of rocks suggests Clearwater Lake is much older .
  