Of those sampled, several frost-mantled craters were crossed, as well as examples of fluidized ejecta and pedestal craters.
Craters designated with alphabetic letters are particularly interesting.
For example, the craters indicated by D and F in the polar stereographic map, are frost-mantled and display anomalously large crater cavity interior deposits. A classic multilobed, fluidized-ejecta crater is shown to the lower right, just southeast of the margin of the martian north polar cap. Many of the impact features north of around 60 degrees North latitude on Mars have large rim relief and rapidly decaying ejecta deposits, relative to similar diameter craters sampled by MOLA in the equatorial and mid-latitudes. Some of the craters show evidence of nearly complete interior infill and subsequent loss of materials, as if these craters are now in the process of being exhumed. Results of MOLA analyses of these polar craters will be presented at the First International Conference on Mars Polar Science as well as at the Fall 1998 American Geophysical Union meeting.