When Did the Light-Toned Layers Form?
When Did the Light-Toned Layers Form?
ESP_070107_1750  Science Theme: Geologic Contacts/Stratigraphy
Light-toned layered deposits are found throughout central Valles Marineris. Most of the deposits tend to be towards the center of the depressions, away from the walls that define our solar system’s largest canyon.

In this image of northwestern Candor Chasma, the light-toned layered deposits are adjacent to the walls. If the deposits are on top of the walls, then we know they were laid down after the chasma had already formed. However, if they are outcropping from within the walls, then they are older deposits that pre-date the chasma’s formation.

Determining when the light-toned layered deposits formed is important for understanding the geologic history of Valles Marineris, especially because these deposits are hydrated and most likely formed in the presence of liquid water.

Written by: Cathy Wetiz (narration: Tre Gibbs)  (20 September 2021)
Acquisition date
11 July 2021

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
261.3 km (162.4 miles)

Original image scale range
from 26.6 cm/pixel (with 1 x 1 binning) to 53.3 cm/pixel (with 2 x 2 binning)

Map projected scale
25 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
61°, with the Sun about 29° above the horizon

Solar longitude
70.3°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  36.7°
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   (435MB)

IRB color
map-projected   (351MB)

Black and white
map-projected  (191MB)
non-map           (315MB)

IRB color
map projected  (88MB)
non-map           (276MB)

Merged IRB
map projected  (128MB)

Merged RGB
map-projected  (122MB)

RGB color
non map           (264MB)
10K (TIFF)

HiClip mini HD

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.