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S. J. Jaret, E. F. Albin (Fernbank Science Center)
Situated in the eastern Terra Meridiani region of the Martian cratered uplands is an ancient 470-km diameter basin called Schiaparelli. In this investigation, Viking Orbiter image mosaics were used as a base to create a detailed geologic map of this impact structure. High resolution Global Surveyor MOC and MOLA data provided information for the interpretation of individual map units. The basin rim (Br) separates distinct sets of interior and exterior units. Within the basin, the following units are found: a) [Im] interior mountain (inner peak ring), b) [Ih] interior hilly material (fallback ejecta), c) [Irp] interior ridged plains (lava flows), and d) [Isp] interior smooth plains (lacustrine deposits). The exterior basin units include: a) [Cu] cratered upland material (target material), b) [Em] exterior mountain (basin ring) c) [Cd] cratered dissected material (continuous ejecta), d) [Erp] exterior ridged plains (lava flows), and e) [Esp] exterior smooth plains (lacustrine deposits). These findings provide clues about the geologic history of Schiaparelli basin. \bigskip
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Bulletin of the American Astronomical Society, 34, #3< br> © 2002. The American Astronomical Soceity.