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Geologic map and coal sections of the Forks Ranch quadrangle, Big Horn County, Montana Geologic map and coal sections of the Forks Ranch quadrangle, Big Horn County, Montana
The Forks Ranch quadrangle lies on the gently-dipping east flank of the Powder River basin, near its trough line.
Geologic map of the Amenthes Quadrangle of Mars Geologic map of the Amenthes Quadrangle of Mars
The Amenthes quadrangle includes two main physiographic and geologic subdivisions. In the southern part of the quadrangle, densely cratered plateaus rise about 3 km above sparsely to moderately cratered plains. The low plains that form Elysium Planitia also build the eastern flank of the Isidis basin, which mostly lies with the adjacent Syrtis Major quadrangle to the west: the Elysium...
Geologic map of the Arcadia Quadrangle of Mars Geologic map of the Arcadia Quadrangle of Mars
The Arcadia quadrangle of Mars contains three distinct geological provinces: (1) the 1000-km-diameter shield field volcano of Alba Patera, which occupies the southwestern quadrant; (2) the complex Tempe province, which comprises a number of younger volcanic and sedimentary blanket deposits over an ancient, highly cratered crust forming a plateau in the southwestern quadrant; and (3) a...