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U.S. Geological Survey, Southwest Region
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The Grimaldi quadrangle lies at the southwest margin of Oceanus Procellarum about 1000 km east of Orientale, the youngest of the lunar multi-ring basins. The distal ends of the ejecta blanket surrounding the Orientale basin partly cover the western third of the quadrangle. The relatively small, two-ring Grimaldi basin is in the northwest corner of the quadrangle, and the Humorum basin lies about 750 km to the southeast. A vestigal multi-ring basin mostly engulfed by mare appears to control the distribution of terra and mare craters Hansteen and Billy are on a northwest-trending topographic high which represents part of the ring system of this basin. Terra materials of distinctive texture, apparently unrelated to...
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