Reference
Rotta, R.B., Evolutionary explanations for anomalous radiocarbon in coal? CRSQ 41(2):104–112, September 2004. 14C in coal was reported by: Baumgardner, J., Humphreys, D., Snelling, A. and Austin, S., The Enigma of the Ubiquity of 14C in Organic Samples Older Than 100 ka, Eos...