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Arabia quadrangle
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The Arabia quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey (USGS) Astrogeology Research Program. The Arabia quadrangle is also referred to as MC-12.
Image of the Arabia Quadrangle (MC-12). The region is dominated with heavily cratered highlands; the northeast part contains Cassini Crater.
Image of the Arabia Quadrangle (MC-12). The region is dominated with heavily cratered highlands; the northeast part contains Cassini Crater.
Layers some with overhang
Layers some with overhang
Layers and layered mounds. Each layer records some sort of change and water may have been involved.
Layers and layered mounds. Each layer records some sort of change and water may have been involved.
Layers. Dark parts are basalt sand that has settled on horizontal surfaces.
Layers. Dark parts are basalt sand that has settled on horizontal surfaces.
Arabia Terra
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Arabia Terra is a large upland region in the north of Mars that lies mostly in the Arabia quadrangle, but a small part is in the Mare Acidalium quadrangle. It is densely cratered and heavily eroded. This battered topography indicates great age, and Arabia Terra is presumed to be one of the oldest terrains on the planet. It covers as much as 4,500 km (2,800 mi) at its longest extent, centered roughly at 21°N 6°E with its eastern and southern regions rising 4 km (13,000 ft) above the north-west. Alongside its many craters, canyons wind through the Arabia Terra, many emptying into the large northern lowlands of the planet, which borders Arabia Terra to the north.
THEMIS daytime infrared image mosaic showing Eden Patera (at center), one of the proposed volcanic caldera complexes in Arabia Terra, and its surround
THEMIS daytime infrared image mosaic showing Eden Patera (at center), one of the proposed volcanic caldera complexes in Arabia Terra, and its surroundings
Ice sheet in Oxus Patera, a caldera in Arabia Terra. The scalloped nicks along the spines of the caldera's ridges are likely cracks caused by the expa
Ice sheet in Oxus Patera, a caldera in Arabia Terra. The scalloped nicks along the spines of the caldera's ridges are likely cracks caused by the expansion and contraction of ice.
Layers in Tikhonravov Crater in Arabia, as seen by Mars Global Surveyor (MGS). Layers may form from volcanoes, the wind, or by deposition under water.
Layers in Tikhonravov Crater in Arabia, as seen by Mars Global Surveyor (MGS). Layers may form from volcanoes, the wind, or by deposition under water. The craters on the left are pedestal craters. Some researchers believe this crater once held a massive lake.
Tikhonravov Crater floor, as seen by Mars Global Surveyor. Click on image to see dark slope streaks and layers.
Tikhonravov Crater floor, as seen by Mars Global Surveyor. Click on image to see dark slope streaks and layers.