The Coprates quadrangle is one of a series of 30 quadrangle maps of Mars used by the United States Geological Survey Astrogeology Research Program. The Coprates quadrangle is also referred to as MC-18
Image of the Coprates Quadrangle (MC-18). The prominent Valles Marineris chasma system intersects the moderately cratered northern part and the faulted highland ridged plains in the southern part.
Ius Chasma is a large canyon in the Coprates quadrangle of Mars at 7° south latitude and 85.8° west longitude. It is about 938 km long and was named after a classical albedo feature name.
Ius Chasma in mosaic of THEMIS infrared images, with parts of Tithonium, Candor and Melas chasmata visible at upper left and right, extreme upper right, and extreme lower right, respectively. Side canyons created by sapping are prominent in the central region. Near the right end are a series of massive landslide deposits, the Ius Labes. Calydon Fossa, a smaller parallel chasm, runs south of Ius Chasma at left.