Sedimentary Units in Meridiani
Sedimentary Units in Meridiani
PSP_005449_1835  Science Theme: Geologic Contacts/Stratigraphy
This image shows outcrops of several units of rock in the Meridiani region of Mars, near the landing site of the Opportunity rover.

Across the image, the tone and texture of the surface changes in a variety of ways. In some areas the surface is knobby, in others pitted or rough; the brightness of the surface also changes, often in conjunction with changes to the texture. This is because different rock layers are being exposed across the scene. Although the area is quite flat on a large scale, slightly different amounts of erosion expose different layers of rock.

These different rock units probably correspond to deposition of sediments under varied conditions, possibly by entirely different processes. Alternatively, the rocks could have all been deposited in the same way, but with different source materials, grain sizes, or cementation of the rock. At the Opportunity landing site, much of the rock appears to be aeolian (wind-deposited) sandstone, but that may represent only a part of a more diverse, thicker accumulation of sediments.

Images like this help to understand the broader picture of sedimentary layering on Mars.

Written by: Colin Dundas  (10 October 2007)
Acquisition date
25 September 2007

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
272.1 km (169.1 miles)

Original image scale range
27.2 cm/pixel (with 1 x 1 binning) so objects ~82 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
38°, with the Sun about 52° above the horizon

Solar longitude
319.7°, Northern Winter

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  334.2°
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

Black and white
map-projected   (1537MB)

IRB color
map-projected   (675MB)

Black and white
map-projected  (719MB)
non-map           (918MB)

IRB color
map projected  (326MB)
non-map           (654MB)

Merged IRB
map projected  (379MB)

Merged RGB
map-projected  (368MB)

RGB color
non map           (643MB)
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.