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8. Microfossils of the Early Archean Apex chert: new evidence of the antiquity of life. Schopf JW Science; 1993 Apr; 260():640-6. PubMed ID: 11539831 [TBL] [Abstract][Full Text] [Related]
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12. Early Archean (3.3-billion to 3.5-billion-year-old) microfossils from Warrawoona Group, Australia. Schopf JW; Packer BM Science; 1987 Jul; 237():70-3. PubMed ID: 11539686 [TBL] [Abstract][Full Text] [Related]
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