Layers in Galle Crater
NASA/JPL/UArizona
Layers in Galle Crater
PSP_002655_1280  Science Theme: Sedimentary/Layering Processes
This image shows part of a large mass of layered rock in Galle Crater, in the southern cratered highlands of Mars.

At low resolution, layers appear as bands and swirls which are nearly horizontal. This causes them to interact dramatically with topography, producing the appearance of folds and loops wrapping around small hills much like lines on a contour map. Zooming in at higher resolution, some long cracks (hundreds of meters long) are cutting across the layers, generally trending northeast-southwest.

At full resolution, details of the layers are often obscured by ripples of wind-blown dust or textured patterns of erosion now eroding the rock. In the best exposures, such as that in the cutout section the layers are fractured into blocks. Some of the layers are relatively resistant, and appear as ridges or fins in the cutout, often with little material supporting them from below. Although this seems to indicate relatively strong, coherent material, few boulders are visible. The ridge-forming layers may be weak, but separated by material with virtually no cohesion.

Polygonal fracture patterns in the dark regolith between distinct layers could be due to ground ice, or regional tectonic stresses.



Written by: Colin Dundas  (16 May 2007)

This is a stereo pair with PSP_003156_1280.
 
Acquisition date
19 February 2007

Local Mars time
15:54

Latitude (centered)
-51.769°

Longitude (East)
329.992°

Spacecraft altitude
256.3 km (159.3 miles)

Original image scale range
25.6 cm/pixel (with 1 x 1 binning) so objects ~77 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
2.9°

Phase angle
71.5°

Solar incidence angle
69°, with the Sun about 21° above the horizon

Solar longitude
186.6°, Northern Autumn

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  29.7°
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   (915MB)

IRB color
map-projected   (439MB)

JP2 EXTRAS
Black and white
map-projected  (364MB)
non-map           (595MB)

IRB color
map projected  (134MB)
non-map           (417MB)

Merged IRB
map projected  (208MB)

Merged RGB
map-projected  (212MB)

RGB color
non map           (423MB)
ANAGLYPHS
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

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/UArizona

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.