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it is 7.5 km in diameter and the age is estimated, based on accompanying chitinozoan microfossils, to be 458 million years (upper ordovician).
==date generale==acesta are peste 7,5 km în diametru și vârsta sa este estimată la 455 milioane ani (ordovicianul superior).
3: 229* hofmann, h. j.; and jackson, g. d.; "shale-facies microfossils from the proterozoic bylot supergroup, baffin island, canada".
"shale-facies microfossils from the proterozoic bylot supergroup, baffin island, canada".