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Optical microscopy
Scientific techniques using a microscope with one or more lenses illuminated with visible light to view small objects.
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Petrography
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Generalized thermal maturity map of Alaska
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Data derived from the 1996 "Generalized Thermal Maturity Map of Alaska" compiled by M.J. Johnsson and D.G. Howell, published in USGS Bulletin 2142. Combines vitrinite reflectance and conodont alteration index in generalized units.