20 Year Retrospective of National Center for Preservation Technology and Training sponsored Archaeology.

Since 1994, the National Center for Preservation Technology and Training, a component of the National Park Service (ncptt.nps.gov), has engaged in state-of-the-art research in archaeological treatments and technologies. The Center provides grants, education, research, and training opportunities in the areas of archaeology and collections, architecture and engineering, materials conservation, and historic landscapes. To date, over $9 million dollars have been spent on sponsored research via our grants program. This symposium is a 20 year retrospective and is focused on the innovative contributions of the award recipients to the archaeological sciences and technologies. Specifically, the researchers will be re-examining their original work and addressing the impact to their respective fields, how their work has influenced their research, and progress in their study areas since the initial award. This seminar includes papers that cover topics ranging from the development and fielding of magnetic susceptibility, archaeogeophysics, multi-beam swath bathymetry, and a friction cone-penetrometer, to plasma extraction ¹⁴C analysis, site location probability models, lithic characterization, ceramic thin-section analysis, freshwater shell artifact and temper sourcing, aerial archaeology, and Native American consultation protocols.