| Hopanes, which originate from bacteria, are the most abundant triterpanes. A distribution with a regular decrease of homohopanes from C<sub>31</sub> to C<sub>35</sub> is thought to be associated with clastic environments.<ref name=ch08r59>Waples, D., W., Machihara, T., 1991, Biomarkers for geologists: Tulsa, AAPG, 91 p.</ref> and/or more oxidizing conditions<ref name=ch08r39>Peters, K., E., Moldowan, J., M., 1993, The Biomarker Guide—Interpreting [[Molecular fossils]] in Petroleum and Ancient Sediments: Englewood Cliffs, New Jersey, Prentice-Hall, 363 p.</ref> | | Hopanes, which originate from bacteria, are the most abundant triterpanes. A distribution with a regular decrease of homohopanes from C<sub>31</sub> to C<sub>35</sub> is thought to be associated with clastic environments.<ref name=ch08r59>Waples, D., W., Machihara, T., 1991, Biomarkers for geologists: Tulsa, AAPG, 91 p.</ref> and/or more oxidizing conditions<ref name=ch08r39>Peters, K., E., Moldowan, J., M., 1993, The Biomarker Guide—Interpreting [[Molecular fossils]] in Petroleum and Ancient Sediments: Englewood Cliffs, New Jersey, Prentice-Hall, 363 p.</ref> |