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Discovery quadrangle : ウィキペディア英語版
Discovery quadrangle

The Discovery quadrangle lies within the heavily cratered part of Mercury in a region roughly antipodal to the 1550-km-wide Caloris Basin. Like the rest of the heavily cratered part of the planet, the quadrangle contains a spectrum of craters and basins ranging in size from those at the limit of resolution of the best photographs (200 m) to those as much as 350 km across, and ranging in degree of freshness from pristine to severely degraded. Interspersed with the craters and basins both in space and time are plains deposits that are probably of several different origins. Because of its small size and very early segregation into core and crust, Mercury seemingly has been a dead planet for a long time—possibly longer than the Moon.〔Trask, N.J. & Dzurisin, D. (1984). ''Geologic Map of the Discovery (H-11) Quadrangle of Mercury.'' U.S. Geological Survey. () Retrieved on 2007-12-07. Prepared for the National Aeronautics and Space Administration by the U.S. Department of the Interior, U.S. Geological Survey.〕〔Trask, N.J. & Guest, J.E. (1975). "Preliminary geologic terrain map of Mercury." ''Journal of Geophysical Research'' 80(17): 2461–2477.〕〔Murray, B.C., Strom, R.G., Trask, N.J., & Gault, D.E. (1975). "Surface history of Mercury: Implications for terrestrial planets." ''Journal of Geophysical Research'' 80(17): 2508–2514.〕 Its geologic history, therefore, records with considerable clarity some of the earliest and most violent events that took place in the inner Solar System.
==Stratigraphy==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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