North is up. This is a portion of Viking 1 Orbiter image 627a28, taken in 1978. The Viking image is presented here as a mercator projection with a scale of 1100 pixels per degree of longitude. The regularly-spaced lineations in the troughs in the lower third of the image are drifts of windblown material. Sun illumination is from the left.
North is up.
The regularly-spaced ridges hidden in the shadow on the caldera floor are drifts of windblown material. Illumination is from the left. North is up. You may need to adjust the images for the gamma of your monitor to insure proper viewing. This MOC image is made available in order to share with the public the excitement of new discoveries being made via the Mars Global Surveyor spacecraft.