PIA08502: Mellish Pedestal


Mellish Pedestal

Caption:

31 May 2006
This Mars Global Surveyor (MGS) Mars Orbiter Camera (MOC) image shows a pedestal crater superposed on the floor of the much larger Mellish Crater. When an impact crater of this type forms, material is thrown onto the adjacent terrain to form portions of the ejecta blanket we see today. If the ejecta blanket is sufficiently rocky, it will protect the underlying terrain from wind erosion. Over time, much of the exposed material surrounding the ejecta blanket will be removed by wind, leaving behind the rocky ejecta and the material below it, resulting in the pedestal-like appearance seen here.

Location near : 73.0°S, 22.7°W
Image width : ~3 km (~1.9 mi)
Illumination from : upper left
Season : Southern Summer

Cataloging Keywords:

Name Value Additional Values
Target Mars
System
Target Type Planet
Mission Mars Global Surveyor (MGS)
Instrument Host Mars Global Surveyor
Host Type Orbiter
Instrument Mars Orbiter Camera (MOC)
Detector
Extra Keywords Crater, Grayscale, Impact
Acquisition Date
Release Date 2006-05-31
Date in Caption 2006-05-31
Image Credit NASA/JPL/Malin Space Science Systems
Source photojournal.jpl.nasa.gov/catalog/PIA08502
Identifier PIA08502