Extended Data Fig. 5: Petrographic context of samples that were digested for REE + Y analyses.
From: Reassessing evidence of life in 3,700-million-year-old rocks of Greenland
a, Slab sample before cutting. b, Slab sample after cutting. ‘M’ denotes the subsample from which analyses ‘M3M’ and ‘M3C’ were derived. ‘C’ denotes the subsample from which analyses ‘C3M’ and ‘C3C’ were derived. Scale bar, 10 mm.
