Changes

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| Use source rock samples that are mature, not postmature

| Use source rock samples that are mature, not postmature

| Since many source rock samples are immature, a comparison with mature oils can be difficult—not only because physical appearances and molecular distributions are different, but also because extracts from immature rocks are sometimes genetically unrelated and compositionally dissimilar to mature extracts and oils ( <ref name=ch08r26>Kohnen, M., E., L., Schouten, S., Sinninghe Damste, J., S., de Leeuw, J., W., Merrit, D., Hayes, J., M., 1992, The combined application of organic sulphur and isotope geochemistry to assess multiple sources of palaeobiochemicals with identical carbon skeletons: Organic Geochemistry, vol. 19, p. 403–419., 10., 1016/0146-6380(92)90008-L</ref> ).

| Since many source rock samples are immature, a comparison with mature oils can be difficult—not only because physical appearances and molecular distributions are different, but also because extracts from immature rocks are sometimes genetically unrelated and compositionally dissimilar to mature extracts and oils.<ref name=ch08r26>Kohnen, M., E., L., Schouten, S., Sinninghe Damste, J., S., de Leeuw, J., W., Merrit, D., Hayes, J., M., 1992, The combined application of organic sulphur and isotope geochemistry to assess multiple sources of palaeobiochemicals with identical carbon skeletons: Organic Geochemistry, vol. 19, p. 403–419., 10., 1016/0146-6380(92)90008-L</ref>

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