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Search indexed USGS publications on groundwater, aquifers, geologic maps, mineral resources and earthquakes. Explore source records by subject and place.

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At least 163 records · Page 9Linked to original sources
USGS1979

Geologic map of the Cebrenia quadrangle of Mars

Most of the Cebrenia quadrangle (lat 30˚ to 65˚ N., long 180˚ to 240˚ W.) is in the circumpolar plains of Mars. Craters from an early episode of intense bombardment have been largely obliterated by later volcanism, tectonism, erosion, and sedimentation by wind and water, and by circumpolar glacial and periglacial processes. South of 47˚ N. the plains are dissected by numerous channels, most of which drained off a broad volcanic upland near the southern border of the quadrangle. The impressive Elysium volcanoes cap the crest of this upland; their northernmost member, Hecates Tholus, lies within the Cebrenia quadrangle. The southeastern part of the Cebrenia quadrangle is dominated by the Phlegra Montes, which may be the only purely tectonic mountain range on Mars. It seems to have been formed by block faulting; there is no evidence that impact of volcanic processes played a role. An ancient pediment appears to have been uplifted by normal faults to form a north- to north-northeast-trending mountain range 1,400 km long, as much as 250 km wide, and more than 1 km high. Its foothills are partly covered by later volcanic and eolian deposits.

IMAP↗
USGS1979

Vegetation map of the southeastern Uinta Basin, Utah and Colorado

This map has been prepared by the U.S. Geological Survey as part of a hydrologic investigation of the southeastern Uinta Basin in cooperation with the Utah State Engineer and the U.S. Bureau of Land Management. The map defines the extent of dominant types of vegetation within the study area prior to proposed oil-shale development. The information presented will be helpful for estimating runoff and ground-water recharge and for identifying large scale vegetation modifications which could result from environmental changes.

Colorado, Utah↗
USGS1979

Geologic map of the Margaritifer Sinus Quadrangle of Mars

The Margaritifer Sinus quadrangle lies within a broad north-sloping trough, the Chryse lowlands, between the elevated Tharsis plateau to the west and the cratered upland to the east. The rugged, uniquely martian chaotic terrain is best developed in this quadrangle. Sinuous furrows a few kilometers wide and as much as several hundred kilometers long cover most of the quadrangle; in several places are broad regions many tens of kilometers wide that appear to be complex channel systems. None of these features can be correlated with markings seen from the Earth. The major part of the quadrangle consists of moderately cratered material containing craters of different morphologic types. This region is typical of the most cratered region of Mars (Jones, 1974), have been previously mapped as cratered terrain, undivided (Carr and others, 1973), as moderately cratered terrain (McCauley and others, 1972), and as plateau plains (Wilhelms, 1974).

IMAP↗
USGS1979

Geologic map of the Phaethontis Quadrangle of Mars

The Phaethontis quadrangle of Mars is dominated by densely cratered uplands and plateaus which form some of the oldest surfaces on the planet. Extensive low-lying areas within the cratered terrains, including the floors of the large craters , are covered to different degrees by plains-forming material. The youngest plains unit surround Tharsis Montes to the north. Various erosional processes, including eolian scour and possibly scarp retreat through volatile-release sapping and mass wasting, producing several distinctive physiographic features: knob and mesa terrains, plains and small knobs, and plateaus dissected by furrows, steep walled gorges, and pits.

IMAP↗