# Casius quadrangle

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Map of Mars

Casius quadrangle Elevation map of Casius quadrangle from Mars Orbiter Laser Altimeter (MOLA) data. Coordinates 47°30′N 270°00′W / 47.5°N 270°W / 47.5; -270

The **Casius quadrangle** is one of a series of [30 quadrangle maps of Mars](/source/List_of_quadrangles_on_Mars) used by the [United States Geological Survey](/source/United_States_Geological_Survey) (USGS) [Astrogeology Research Program](/source/Astrogeology_Research_Program). The [quadrangle](/source/Quadrangle_(geography)) is located in the north-central portion of Mars' eastern hemisphere and covers 60° to 120° east longitude (240° to 300° west longitude) and 30° to 65° north latitude. The quadrangle uses a [Lambert conformal conic projection](/source/Lambert_conformal_conic_projection) at a nominal scale of 1:5,000,000 (1:5M). The Casius quadrangle is also referred to as MC-6 (Mars Chart-6).[1] Casius quadrangle contains part of [Utopia Planitia](/source/Utopia_Planitia) and a small part of [Terra Sabaea](/source/Terra_Sabaea). The southern and northern borders of the Casius quadrangle are approximately 3,065 km and 1,500 km wide, respectively. The north to south distance is about 2,050 km (slightly less than the length of Greenland).[2] The quadrangle covers an approximate area of 4.9 million square km, or a little over 3% of Mars' surface area.[3]

## Origin of name

Casius is the name of a [telescopic albedo feature](/source/Classical_albedo_features_on_Mars) located at 40° N and 100° E on Mars. The feature was named by [Schiaparelli](/source/Giovanni_Schiaparelli) in 1888 after [Mt Casius](/source/Ras_Kouroun) in Egypt, famous in antiquity for the nearby [coastal marshes](/source/Lake_Bardawil) in which whole armies were reputed to have drowned. The name was approved by the [International Astronomical Union](/source/International_Astronomical_Union) (IAU) in 1958.[4]

## Physiography and geology

The high latitude Casius quadrangle bears several features that are believed to indicate the presence of ground ice.[*[citation needed](https://en.wikipedia.org/wiki/Wikipedia:Citation_needed)*] [Patterned ground](/source/Patterned_ground) is one such feature. Usually, polygonal shapes are found poleward of 55 degrees latitude.[5] Other features associated with ground ice are [scalloped topography](/source/Scalloped_topography),[6] [Ring mold craters](/source/Ring_mold_crater), and [concentric crater fill](/source/Concentric_crater_fill).

## See also

- [Climate of Mars](/source/Climate_of_Mars)

- [Geology of Mars](/source/Geology_of_Mars)

- [Patterned ground](/source/Patterned_ground)

- [Water on Mars](/source/Water_on_Mars)

## References

1. **[^](#cite_ref-1)** Davies, M.E.; Batson, R.M.; Wu, S.S.C. "Geodesy and Cartography" in Kieffer, H.H.; Jakosky, B.M.; Snyder, C.W.; Matthews, M.S., Eds. *Mars.* University of Arizona Press: Tucson, 1992.

1. **[^](#cite_ref-2)** Distances calculated using NASA World Wind measuring tool. [http://worldwind.arc.nasa.gov/](https://worldwind.arc.nasa.gov/) [Archived](https://web.archive.org/web/20180106075159/http://worldwind.arc.nasa.gov/) 2018-01-06 at the [Wayback Machine](/source/Wayback_Machine).

1. **[^](#cite_ref-3)** Approximated by integrating latitudinal strips with an area of R^2 (L1-L2)(cos(A)dA) from 30° to 65° latitude; where R = 3889 km, A is latitude, and angles expressed in radians. See: [https://stackoverflow.com/questions/1340223/calculating-area-enclosed-by-arbitrary-polygon-on-earths-surface](https://stackoverflow.com/questions/1340223/calculating-area-enclosed-by-arbitrary-polygon-on-earths-surface).

1. **[^](#cite_ref-4)** USGS Gazetteer of Planetary Nomenclature. Mars. [https://planetarynames.wr.usgs.gov/](https://planetarynames.wr.usgs.gov/).

1. **[^](#cite_ref-5)** Mangold, N. 2005. High latitude patterned grounds on Mars: Classification, distribution and climatic control. Icarus. 174-336-359.

1. **[^](#cite_ref-6)** ["HiRISE | Scalloped Topography in Peneus Patera Crater"](https://web.archive.org/web/20161001224222/http://hiroc.lpl.arizona.edu/images/PSP/diafotizo.php?ID=PSP_002296_1215). Archived from [the original](http://hiroc.lpl.arizona.edu/images/PSP/diafotizo.php?ID=PSP_002296_1215) on 2016-10-01. Retrieved 2009-05-29.

## External links

Wikimedia Commons has media related to [Casius quadrangle](https://commons.wikimedia.org/wiki/Category:Casius_quadrangle).

- [Martian Ice - Jim Secosky - 16th Annual International Mars Society Convention](https://www.youtube.com/watch?v=_sUUKcZaTgA)

- [T. Gordon Wasilewski - Water on Mars - 20th Annual International Mars Society Convention](https://www.youtube.com/watch?v=kpnTh3qlObk). Describes how to get water from ice in the ground

v t e Quadrangles on Mars MC-01 Mare Boreum (features) MC-02 Diacria (features) MC-03 Arcadia (features) MC-04 Acidalium (features) MC-05 Ismenius Lacus (features) MC-06 Casius (features) MC-07 Cebrenia (features) MC-08 Amazonis (features) MC-09 Tharsis (features) MC-10 Lunae Palus (features) MC-11 Oxia Palus (features) MC-12 Arabia (features) MC-13 Syrtis Major (features) MC-14 Amenthes (features) MC-15 Elysium (features) MC-16 Memnonia (features) MC-17 Phoenicis Lacus (features) MC-18 Coprates (features) MC-19 Margaritifer Sinus (features) MC-20 Sinus Sabaeus (features) MC-21 Iapygia (features) MC-22 Mare Tyrrhenum (features) MC-23 Aeolis (features) MC-24 Phaethontis (features) MC-25 Thaumasia (features) MC-26 Argyre (features) MC-27 Noachis (features) MC-28 Hellas (features) MC-29 Eridania (features) MC-30 Mare Australe (features)

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Adapted from the Wikipedia article [Casius quadrangle](https://en.wikipedia.org/wiki/Casius_quadrangle) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Casius_quadrangle?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.