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A quadrangle is defined by north and south boundaries of constant latitude (which are not great circles so are curved), and by east and west boundaries of constant longitude. From approximately 1947–1992, the USGS produced the 7.5 minute series, with each map covering an area one-quarter of the older 15-minute quad series, which it replaced. [1]
"The geology and ore deposits of the Bisbee quadrangle, Arizona". U.S. Geological Survey Professional Paper. Professional Paper. 21. doi:10.3133/pp21. hdl: 2346/61697; Sabins, Floyd F. (1957). "Geology of the Cochise Head and Western Part of the Vanar Quadrangles, Arizona". Geological Society of America Bulletin. 68 (10): 1315.
The Caloris basin is centered in Raditladi quadrangle, though it overlaps significantly with the Tolstoj and Shakespeare quadrangles. The Borealis quadrangle is north of Raditladi quadrangle. To the west is Hokusai quadrangle, and to the east is Shakespeare quadrangle. To the southwest is Eminescu quadrangle, and to the southeast is Tolstoj ...
Planimetrically arcuate escarpments in the Discovery quadrangle cut intercrater plains and crater materials as young as c4. These scarps are typically 100 to 400 km long and 0.5 to 1.0 km high, and they have convex-upward slopes in cross section that steepen from brink to base. More trend closer to north–south than to east–west.
Most pictures of the quadrangle were obtained at high sun angles as the Mariner 10 spacecraft receded from the planet. Geologic map units are described and classified on the basis of morphology, texture, and albedo, and they are assigned relative ages based on stratigraphic relations and on visual comparisons of the density of superposed craters.
The interaction between basins, craters, and plains in this quadrangle provides important clues to geologic processes that have formed the morphology of the mercurian surface. [ 1 ] Several low- albedo features are evident in Earth-based views of the Michelangelo quadrangle, [ 2 ] but these features do not appear to correlate directly with any ...
Gale Crater, in the northwestern part of the Aeolis quadrangle, is of special interest to geologists because it contains a 2–4 km (1.2–2.5 mi) high mound of layered sedimentary rocks. On 28 March 2012 this mound was named "Mount Sharp" by NASA in honor of Robert P. Sharp (1911–2004), a planetary scientist of early Mars missions .
The Elysium quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The Elysium quadrangle is also referred to as MC-15 (Mars Chart-15). [1] The name Elysium refers to a place of reward (Heaven), according to Homer in the Odyssey. [2]