Changes

==Diterpanes==

==Diterpanes==

[[file:oiloil-and-oilsource-rock-correlations_fig8-34.png|thumb|{{figure number|12}}From Huang et al.;<ref name=ch08r19>Huang, Y., Ansong, G., Jiamo, F., Guoying, S., Biqiang, Z., Yixian, C., Maofen, L., 1992, The investigation of characteristics of biomarker assemblages and their precursors in Damintun ultra-high wax oils and related source rocks: Organic Geochemistry, vol. 19, p. 29–39, DOI: 10.1016/0146-6380(92)90025-S.</ref> reprinted with permission from Elsevier.]]

[[file:oiloil-and-oilsource-rock-correlations_fig8-34.png|thumb|{{figure number|12}}m/z 123 mass chromatograms of two oils from northeast China. From Huang et al.;<ref name=ch08r19>Huang, Y., Ansong, G., Jiamo, F., Guoying, S., Biqiang, Z., Yixian, C., Maofen, L., 1992, The investigation of characteristics of biomarker assemblages and their precursors in Damintun ultra-high wax oils and related source rocks: Organic Geochemistry, vol. 19, p. 29–39, DOI: 10.1016/0146-6380(92)90025-S.</ref> reprinted with permission from Elsevier.]]

Other diterpane and sesquiterpane distributions are also used for correlations. Most diterpanes originate from terrestrial resins, but microbial sources are also known.<ref name=ch08r39 /> Sesquiterpanes derive primarily from terrestrial plant resins. Most resin-derived compounds are of Tertiary or possibly Late Cretaceous age.

Other diterpane and sesquiterpane distributions are also used for correlations. Most diterpanes originate from terrestrial resins, but microbial sources are also known.<ref name=ch08r39 /> Sesquiterpanes derive primarily from terrestrial plant resins. Most resin-derived compounds are of Tertiary or possibly Late Cretaceous age.