# Anseris Mons

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Martian mountain

Anseris Mons Feature type Mountain Coordinates 29°49′S 86°39′E / 29.81°S 86.65°E / -29.81; 86.65

**Anseris Mons** [/ˈænsərɪs ˈmɒnz/](https://en.wikipedia.org/wiki/Help:IPA/English) is an isolated [massif](/source/Massif) (mountain) in the southern highlands of [Mars](/source/Mars), located at the northeastern edge of [Hellas Planitia](/source/Hellas_Planitia) at longitude 86.65°E and latitude 29.81°S. The mountain is 58 km (36 mi) in diameter and rises to an elevation of approximately 4,200 m (13,780 ft) above [datum](/source/Datum_(geodesy)) ([martian "sea" level](/source/Geography_of_Mars#Zero_elevation)) or about 6,200 m (20,300 ft) above the surrounding plains.[1] The mountain lies in the southeastern quarter of the [Iapygia quadrangle](/source/Iapygia_quadrangle) (MC-21), straddling the boundary with the adjoining [Hellas quadrangle](/source/Hellas_quadrangle) (MC-28) to the south.

Anseris Mons is named from Anseris Fons, a [telescopic albedo feature](/source/Classical_albedo_features_on_Mars) mapped by Greek astronomer [E. M. Antoniadi](/source/E._M._Antoniadi) in 1930. The name was approved by the [International Astronomical Union](/source/International_Astronomical_Union) (IAU) in 1991.[2]

Anseris Mons is not a volcano. Geologically, the massif is thought to be the eroded remnant of an ancient [crustal block](/source/Crustal_block) uplifted from depths of several kilometers[3] in the formation of the Hellas impact basin during the [period of heavy bombardment](/source/Late_Heavy_Bombardment).[4] Anseris Mons is the [type area](/source/Type_locality_(geology)) for a large set of rugged mountain blocks (>25 km across) that occur in a relatively continuous band 200 to 500 km wide around the western, northeastern, eastern, and southeastern rim of the Hellas basin. Many of the blocks, particularly along the western rim, are concentric with the basin and bounded by faults.[4]

Rocks making up Anseris Mons and other massifs around Hellas are mapped as [Noachian](/source/Noachian_(Mars)) in age.[4][5] However, work by Herbert Frey at NASA’s [Goddard Spaceflight Center](/source/Goddard_Spaceflight_Center) using [Mars Orbital Laser Altimeter](/source/Mars_Orbital_Laser_Altimeter) (MOLA) data indicates that the southern highlands of Mars contain numerous buried impact basins that are older than the visible Noachian-aged surfaces and which pre-date the Hellas impact. He suggests that the Hellas impact should mark the beginning of the Noachian period (base of the Noachian [system](/source/System_(stratigraphy))). If Frey is correct, then Anseris Mons bedrock is actually pre-Noachian in age, perhaps dating back to over 4.1 billion years ago.[6][7]

The Anseris Mons massif has undergone a significant amount of erosion since it was uplifted. The flanks of the mountain have huge triangular [re-entrants](/source/Salients%2C_re-entrants_and_pockets) and associated [spurs](/source/Spur_(mountain)), which give the massif a broad, pyramidal shape. The re-entrants were likely produced through a variety of [mass-wasting](/source/Mass_wasting) and [periglacial](/source/Periglacial)/glacial processes. A large [cirque](/source/Cirque)-like re-entrant with channelized debris aprons or [fans](/source/Alluvial_fan) is present on the south side of the mountain.

## Images

		- Anseris Mons

		- Northern face of Anseris Mons showing areas of exposed bedrock.

## See also

- [List of mountains on Mars](/source/List_of_mountains_on_Mars)

- [List of mountains on Mars by height](/source/List_of_mountains_on_Mars_by_height)

- [List of tallest mountains in the Solar System](/source/List_of_tallest_mountains_in_the_Solar_System)

## References

Wikimedia Commons has media related to [Anseris Mons](https://commons.wikimedia.org/wiki/Category:Anseris_Mons).

1. **[^](#cite_ref-1)** JMARS MOLA elevation dataset. Christensen, P.; Gorelick, N.; Anwar, S.; Dickenshied, S.; Edwards, C.; Engle, E. (2007) "[New Insights About Mars From the Creation and Analysis of Mars Global Datasets](http://adsabs.harvard.edu/abs/2007AGUFM.P11E..01C);" American Geophysical Union, Fall Meeting, abstract #P11E-01.

1. **[^](#cite_ref-2)** [USGS Gazetteer of Planetary Nomenclature](http://planetarynames.wr.usgs.gov./Feature/288). Mars.

1. **[^](#cite_ref-Leonard1_3-0)** Leonard, G.J.; Tanaka, K.L. (2001). [Geologic Map of the Hellas Region of Mars](https://pubs.usgs.gov/imap/i2694/i2694pamphlet.pdf). Pamphlet to Accompany Map I-2694. U.S. Geological Survey, p. 3.

1. ^ [***a***](#cite_ref-Leonard2_4-0) [***b***](#cite_ref-Leonard2_4-1) [***c***](#cite_ref-Leonard2_4-2) Leonard, G.J.; Tanaka, K.L. (2001). [Geologic Map of the Hellas Region of Mars](https://pubs.usgs.gov/imap/i2694/i2694.pdf)[*[permanent dead link](https://en.wikipedia.org/wiki/Wikipedia:Link_rot)*]. U.S. Geological Survey, Geologic Investigations Series I-2694.

1. **[^](#cite_ref-Greeley_5-0)** Greeley, R; Guest, J.E. (1987) Geologic Map of the Eastern Equatorial Region of Mars. U.S. Geological Survey, M 15M, 0/270 G.

1. **[^](#cite_ref-6)** Frey, H.V. (2003). [Buried Impact Basins and the Earliest History of Mars](http://www.lpi.usra.edu/meetings/sixthmars2003/pdf/3104.pdf). Sixth International Conference on Mars, Abstract #3104.

1. **[^](#cite_ref-7)** Carr, M.H.; Head, J.W. (2010). Geologic History of Mars. *Earth Planet. Sci. Lett.,* **294**, 185–203. [doi](/source/Doi_(identifier)):[10.1016/j.espl.2009.06.042](https://doi.org/10.1016%2Fj.espl.2009.06.042).

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