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→Vitrinite
==Vitrinite==
==Vitrinite==
Vitrinite is a coaly organic maceral derived from the connective tissue of vascular plants. The reflectance of vitrinite changes with heat. [[Vitrinite reflectance]] (V<sub>r</sub> or R<sub>o</sub>), the most commonly used thermal indicator, is the benchmark for maturation studies in the petroleum and coal industries.<ref name=ch17r36>Dow, W., G., O'Connor, D., I., 1982, Kerogen maturity and type by reflected light microscopy applied to petroleum generation, in How To Assess Maturation and Paleotemperatures: SEPM Short Course Notes, p. 79–99.</ref> This technique is primarily useful for Devonian and younger clastic sediments and [[coal]]s.
Vitrinite is a coaly organic [[maceral]] derived from the connective tissue of vascular plants. The reflectance of vitrinite changes with heat. [[Vitrinite reflectance]] (V<sub>r</sub> or R<sub>o</sub>), the most commonly used thermal indicator, is the benchmark for maturation studies in the petroleum and coal industries.<ref name=ch17r36>Dow, W., G., O'Connor, D., I., 1982, Kerogen maturity and type by reflected light microscopy applied to petroleum generation, in How To Assess Maturation and Paleotemperatures: SEPM Short Course Notes, p. 79–99.</ref> This technique is primarily useful for Devonian and younger clastic sediments and [[coal]]s.
==Pollen and spores==
==Pollen and spores==