Changes

[[:file:oiloil-and-oilsource-rock-correlations_fig8-23.png|Figure 1]] shows m/z 217 mass fragmentograms from two oils showing quite different distributions of regular steranes. The top example is dominated by C₂₉ steranes with only moderate amounts of C₂₇ and C₂₈. The bottom sample, in contrast, shows similar amounts of all three homologs plus moderate amounts of the C₃₀ steranes (four unlabeled peaks to the far right).

[[:file:oiloil-and-oilsource-rock-correlations_fig8-23.png|Figure 1]] shows m/z 217 mass fragmentograms from two oils showing quite different distributions of regular steranes. The top example is dominated by C₂₉ steranes with only moderate amounts of C₂₇ and C₂₈. The bottom sample, in contrast, shows similar amounts of all three homologs plus moderate amounts of the C₃₀ steranes (four unlabeled peaks to the far right).

[[:file:oiloil-and-oilsource-rock-correlations_fig8-24.png|Figure 2]] shows a ternary diagram, a convenient and common way of displaying basic data on sterane distributions. This example shows the relative proportions of the C₂₇, C₂₈, and C₂₉ regular steranes for several extracts from two distinct facies within the nonmarine Elko Formation (Eocene/Oligocene) of Nevada. The lignitic siltstones are dominated by terrestrial plant material, whereas the oil shales are made up of lacustrine algae.

[[:file:oiloil-and-oilsource-rock-correlations_fig8-24.png|Figure 2]] shows a ternary diagram, a convenient and common way of displaying basic data on sterane distributions. This example shows the relative proportions of the C₂₇, C₂₈, and C₂₉ regular steranes for several extracts from two distinct facies within the nonmarine Elko Formation (Eocene/Oligocene) of Nevada. The lignitic siltstones are dominated by terrestrial plant material, whereas the [[oil shales]] are made up of lacustrine algae.

==4-methylsteranes==

==4-methylsteranes==