Light from a tungsten filament source is passed through sections of sediment 1 to 6 mm thick. Transmitted infrared radiation is recorded by an ordinary camera loaded with infrared sensitive film. Sediments are generally more transparent to infrared radiation than to white light. For this reason, infrared photographs reveal sedimentary structures that are difficult or impossible to resolve with the visible spectrum. Infrared film can detect subtle differences in density, composition, and texture. This technique is best applied to relatively clean, sand-sized sediments because of their high infrared transparency.

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