North Polar Layers: Streaking and Unconformity
North Polar Layers: Streaking and Unconformity
ESP_018160_2595  Science Theme: Polar Geology
In geology, an unconformity is a buried erosion surface, where the bedding layers don’t match. It doesn’t mean a mismatch in attitudes and beliefs, with rebellious behavior like streaking. But Mars does have streaking of a different kind, from the wind.

This oblique image of part of the North Polar layered deposits, acquired in the summertime, shows both phenomena in the upper and lower panels, plus a topographic bend in the middle panel. Blue areas in this enhanced color image are covered by frost, whereas the darker colors are from differences in contamination and texture of the icy layers.

Written by: Alfred McEwen  (18 September 2017)

This is a stereo pair with ESP_018265_2595.
Acquisition date
11 June 2010

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
320.3 km (199.0 miles)

Original image scale range
35.2 cm/pixel (with 1 x 1 binning) so objects ~106 cm across are resolved

Map projected scale
25 cm/pixel

Map projection

Emission angle

Phase angle

Solar incidence angle
59°, with the Sun about 31° above the horizon

Solar longitude
103.1°, Northern Summer

For non-map projected images
North azimuth:  93°
Sub-solar azimuth:  322.3°
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IRB color
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Merged IRB
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Merged RGB
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IRB color
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Black and white
map-projected  (501MB)
non-map           (356MB)

IRB color
map projected  (131MB)
non-map           (399MB)

Merged IRB
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Merged RGB
map-projected  (366MB)

RGB color
non map           (345MB)
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

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

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

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.