Akiyama M, Shimoyama A, Ponnamperuma C
Orig Life. 1982 Jun;12(2):215-27. doi: 10.1007/BF00927147.
Amino acids were recovered at concentration level of 10-9 M/g from the interior of chert and dolomite of the Late Precambrian Thule Group. Examination of the stability of amino acids in chert under dry-heating conditions suggests that these amino acids have been preserved with a predominance of L-enantiomers in the precambrian chert. Enantiomer analysis of amino acids in dolomite showed a thermal effect resulting from a late precambrian igneous intrusion. This evidence indicates that the amino acids isolated from the Thule samples were chemical fossils and not recent contaminants.
在前寒武纪图勒群的燧石和白云石内部，以10-9摩尔/克的浓度水平回收了氨基酸。对燧石中氨基酸在干热条件下稳定性的研究表明，这些氨基酸在前寒武纪燧石中以L-对映体为主被保存下来。白云石中氨基酸的对映体分析显示，前寒武纪火成岩侵入产生了热效应。这一证据表明，从图勒样品中分离出的氨基酸是化学化石而非近期的污染物。
