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22 June 2005 This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a small impact crater with a " butterfly"ejecta pattern. The butterfly pattern results from an oblique impact. Not all oblique impacts result in an elliptical crater, but they can result in a non-radial pattern of ejecta distribution. The two-toned nature of the ejecta -- with dark material near the crater and brighter material further away -- might indicate the nature of subsurface materials. Below the surface, there may be a layer of lighter-toned material, underlain by a layer of darker material. The impact throws these materials out in a pattern that reflects the nature of the underlying layers.

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      EUN,LOM,LRE4,hdl:10494/259814,work-cmr-id:259814,http://photojournal.jpl.nasa.gov:http://photojournal.jpl.nasa.gov/catalog/PIA03961,ilox,learning resource exchange,LRE metadata application profile,LRE

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