Changes

==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_r or R_o), 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 coals.

Vitrinite is a coaly organic maceral derived from the connective tissue of vascular plants. The reflectance of vitrinite changes with heat. [[Vitrinite reflectance]] (V_r or R_o), 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==

==Other microfossils==

==Other microfossils==

Fossils composed of phosphate (conodonts), carbonate (ostracods), and agglutinated grains (agglutinated foraminifera) are also used for geothermometry. The organic framework of these fossils responds to thermal stress with color change. Of these, conodonts ([[conodont alteration index]], or CAI) are the most widely used<ref name=ch17r37>Epstein, A. G., Epstein, J. B., Harris, L. D., 1977, Conodont color alteration—an index to organic metamorphism: U., S. Geological Survey Professional Paper 995, p. 1–27.</ref> and conodont alteration values are calibrated to the vitrinite reflectance scale. The use of ostracods<ref name=ch17r1>Ainsworth, N., R., Burnett, R., D., Kontrovitz, M., 1990, Ostracod colour change by thermal alteration, offshore Ireland and Western UK: Marine and Petroleum Geology, vol. 7, p. 288–297, DOI: 10.1016/0264-8172(90)90006-3</ref> and foraminifera<ref name=ch17r64>McNeil, D., H., Issler, D., R., 1992, Correlation of foraminiferal coloration (FCI) and time-temperature (TTI) indices from Beaufort Sea exploration data: AAPG Annual Convention Abstracts, p. 87.</ref> is a newly emerging approach and is not yet calibrated to vitrinite reflectance standards. The potential of these fossils is important because they commonly occur in lithologies devoid of organic-walled fossil remains (e.g., limestones, dolomites, fine-grained sands).

Fossils composed of phosphate ([[conodont]]s), carbonate ([[ostracod]]s), and agglutinated grains (agglutinated [[foraminifera]]) are also used for geothermometry. The organic framework of these fossils responds to thermal stress with color change. Of these, conodonts ([[conodont alteration index]], or CAI) are the most widely used<ref name=ch17r37>Epstein, A. G., Epstein, J. B., Harris, L. D., 1977, Conodont color alteration—an index to organic metamorphism: U., S. Geological Survey Professional Paper 995, p. 1–27.</ref> and conodont alteration values are calibrated to the vitrinite reflectance scale. The use of ostracods<ref name=ch17r1>Ainsworth, N., R., Burnett, R., D., Kontrovitz, M., 1990, Ostracod colour change by thermal alteration, offshore Ireland and Western UK: Marine and Petroleum Geology, vol. 7, p. 288–297, DOI: 10.1016/0264-8172(90)90006-3</ref> and foraminifera<ref name=ch17r64>McNeil, D., H., Issler, D., R., 1992, Correlation of foraminiferal coloration (FCI) and time-temperature (TTI) indices from Beaufort Sea exploration data: AAPG Annual Convention Abstracts, p. 87.</ref> is a newly emerging approach and is not yet calibrated to vitrinite reflectance standards. The potential of these fossils is important because they commonly occur in lithologies devoid of organic-walled fossil remains (e.g., limestones, dolomites, fine-grained sands).

==Whole kerogen analysis==

==Whole kerogen analysis==