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A "quadrangle" is a topographic map produced by the United States Geological Survey (USGS) covering the United States. The maps are usually named after local physiographic features. The shorthand " quad " is also used, especially with the name of the map; for example, "the Ranger Creek, Texas quad".
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 ...
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 ...
Also called Indianite. A mineral from the lime-rich end of the plagioclase group of minerals. Anorthites are usually silicates of calcium and aluminium occurring in some basic igneous rocks, typically those produced by the contact metamorphism of impure calcareous sediments. anticline An arched fold in which the layers usually dip away from the fold axis. Contrast syncline. aphanic Having the ...
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 high obliquity of the images, the wide range in sun-elevation angles, and the complete transection of the quadrangle by the gap in coverage greatly hamper geologic mapping. Only in about 15 percent of the quadrangle, near the southeast corner, do data permit separation of units with the confidence possible in other quadrangles on Mercury.
The surface of the planet Mercury has been divided into fifteen quadrangles, designated H-1 to H-15 (the 'H' stands for Hermes, the Greek equivalent of Mercury). [1] The quadrangles are named for prominent surface features visible within each area. [1]
The recognizable geologic history of the quadrangle ends with these events probably several billion years ago. A summary of the generalized geology history of Mercury was given by Guest and O'Donnell [7] and Davies and others. [4]