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. 2015 Apr 27;112(19):5915–5920. doi: 10.1073/pnas.1419563112

Fig. 1.

Fig. 1.

Hopanes and steranes in rock extracts from AIDP-2 compared with RHDH2A. Comparison and lithological correlation of the intersected stratigraphy of AIDP-2 (Center Left) and RHDH2A (Center Right) based on previous descriptions of RHDH2A (3, 19). The age references are listed in SI Appendix, and red markers denote the stratigraphic depths of analyzed samples (SI Appendix, Table S1). The MRM analyses of hopanes and steranes monitored the transitions from the molecular ion to the m/z 191 and m/z 217 fragments, respectively. In an RHDH2A sample from the Carawine Dolomite, the C30–34 hopane and C26–29 sterane concentrations are higher in the core surfaces (surf.) compared with the interior (Right). In contrast, hopanes and steranes were not detected in MRM analyses of either interiors or exteriors of a correlative sample from the Carawine Dolomite recovered at 170.4 m in AIDP-2 (Top Left) or from the underlying Roy Hill Member of the Jeerinah Formation at 325.5 m (Bottom Left).