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{{short description|Crater on Mars}}
'''Joly''' is an [[impact crater]] on [[Mars]], located at 74.7°S latitude and 42.7°W longitude in the [[Mare Australe quadrangle]]. It measures {{convert|79.9
== Spiders ==
During the winter, much frost accumulates. It freezes out directly onto the surface of the permanent polar cap, which is made of water ice covered with layers of dust and sand. The deposit begins as a layer of dusty {{CO2}} frost. Over the winter, it recrystallizes and becomes denser. The dust and sand particles caught in the frost slowly sink. By the time temperatures rise in the spring, the frost layer has become a slab of semi-transparent ice about
Many ideas have been advanced to explain these features.<ref name=Kieffer2000 >{{Cite journal|first=H. H. | last=Kieffer |title=Mars Polar Science 2000 - Annual Punctuated CO<sub>2</sub> Slab-ice and Jets on Mars.| date=2000| url=http://www.lpi.usra.edu/meetings/polar2000/pdf/4095.pdf| access-date=6 September 2009 }}</ref><ref name=Kieffer2003 >{{Cite journal| first=Hugh H. |last=Kieffer |title=Third Mars Polar Science Conference (2003)- Behavior of Solid CO | date=2003 |url=http://www.lpi.usra.edu/meetings/polar2003/pdf/8083.pdf| access-date=6 September 2009 }}</ref><ref name=Portyankina >{{Cite journal|title=Fourth Mars Polar Science Conference - Simulations of Geyser-Type Eruptions in Cryptic Region of Martian South| editor-first=G. |editor-last=Portyankina| date=2006| url=http://www.lpi.usra.edu/meetings/polar2006/pdf/8040.pdf| access-date=11 August 2009 }}</ref><ref name=clathrate >{{Cite journal |title=Lunar and Planetary Science XXXV (2004) - Stratigraphy of Special Layers – Transient Ones on Permeable Ones: Examples| editor=Sz. Bérczi| display-editors=etal| date=2004| url=http://www.lpi.usra.edu/meetings/lpsc2004/pdf/1317.pdf| access-date=12 August 2009}}</ref><ref name=2006-100 >{{cite news | title=NASA Findings Suggest Jets Bursting From Martian Ice Cap | date=16 August 2006 | publisher=NASA | url=http://www.jpl.nasa.gov/news/news.cfm?release=2006-100 | work=[[Jet Propulsion Laboratory]] | access-date=11 August 2009 | archive-date=10 October 2009 | archive-url=https://web.archive.org/web/20091010164741/http://www.jpl.nasa.gov/news/news.cfm?release=2006-100 | url-status=dead }}</ref><ref>{{cite journal | doi = 10.1016/j.icarus.2009.07.021 | title = HiRISE observations of gas sublimation-driven activity in Mars' southern polar regions: I. Erosion of the surface | journal=Icarus | date = 2010 | display-authors = 6 | author = C.J. Hansen | author2 = N. Thomas | author3 = G. Portyankina| author4 = A. McEwen | author5 = T. Becker| author6 = S. Byrne | author7 = K. Herkenhoff| author8 = H. Kieffer | author9 = M. Mellon | volume = 205 | issue = 1 | pages = 283–295| url = http://www.lpl.arizona.edu/~shane/publications/hansen_etal_icarus_2010.pdf | access-date =26 July 2010 | bibcode = 2010Icar..205..283H }}</ref> These features can be seen in some of the pictures below.
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