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Amthor, Joachim E.; Grotzinger, John P.; Schröder, Stefan; Bowring, Samuel A.; Ramezani, Jahandar; Martin, Mark W.; Matter, Albert (2003). Extinction of Cloudina and Namacalathus at the Precambrian-Cambrian boundary in Oman. Geology, 31(5), pp. 431-434. Geological Society of America 10.1130/0091-7613(2003)031<0431:EOCANA>2.0.CO;2
