Basal Exposure of the South Polar Layered Deposits
NASA/JPL/UArizona
Basal Exposure of the South Polar Layered Deposits
PSP_006243_0975  Science Theme: Polar Geology
This image shows a portion of the South Polar layered deposits near the base. Illumination is from the lower right, and the scene width is 6 kilometers.

The South Polar layered deposits are an accumulation of layers of mostly water ice and dust, similar in some ways to the ice caps in Greenland and Antarctica. Often, layers near the base of terrestrial ice caps are deformed because of ice flow and because of sliding of the ice on the underlying surface. On Mars, the polar layered deposits are likely frozen to the underlying materials, and thus do not slide. It is also likely too cold for the ice to flow very much.

These basal layers of the South Polar layered deposits do show some interesting wavy patterns that may be due either to simple erosion or to some kind of flow and folding, possibly having occurred in the distant past. In the lower right hand corner some layers appear to be truncated against others, possibly indicating what is called an “unconformity,” formed when layers are eroded and then new layers are deposited on top.



Written by: Kathryn Fishbaugh  (12 December 2007)
 
Acquisition date
25 November 2007

Local Mars time
15:43

Latitude (centered)
-82.639°

Longitude (East)
313.303°

Spacecraft altitude
248.4 km (154.4 miles)

Original image scale range
49.7 cm/pixel (with 2 x 2 binning) so objects ~149 cm across are resolved

Map projected scale
50 cm/pixel

Map projection
Polarstereographic

Emission angle
0.1°

Phase angle
83.0°

Solar incidence angle
83°, with the Sun about 7° above the horizon

Solar longitude
353.0°, Northern Winter

For non-map projected images
North azimuth:  112°
Sub-solar azimuth:  54.7°
JPEG
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
map projected

RGB color
non-map projected

JP2
Black and white
map-projected   (624MB)

IRB color
map-projected   (289MB)

JP2 EXTRAS
Black and white
map-projected  (387MB)
non-map           (401MB)

IRB color
map projected  (143MB)
non-map           (310MB)

Merged IRB
map projected  (575MB)

Merged RGB
map-projected  (555MB)

RGB color
non map           (301MB)
ADDITIONAL INFORMATION
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products
HiView

NB
IRB: infrared-red-blue
RGB: red-green-blue
About color products (PDF)

Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

USAGE POLICY
All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:
NASA/JPL/University of Arizona

POSTSCRIPT
NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.