05.15.2017 From 'Tribulation' to 'Perseverance' on Mars
03.29.2017 A Decade of Compiling the Sharpest Mars Map
03.09.2017 Back-to-Back Martian Dust Storms
02.08.2017 Mars Reconnaissance Orbiter Observes Changes
01.25.2017 'Wing' Dike of Hardened Lava in New Mexico
01.25.2017 Blade-Like Martian Walls Outline Polygons
01.06.2017 Earth and Its Moon, as Seen From Mars
11.15.2016 Schiaparelli Impact Site on Mars, Stereo
11.03.2016 Schiaparelli Impact Site on Mars, in Color
03.30.2016 Erisa Hines
03.30.2016 Buzz Aldrin
03.21.2016 For a Decade Orbiting Mars: One Recent View
03.09.2016 For a Decade Orbiting Mars: One Recent View
03.09.2016 Mars Reconnaissance Orbiter By the Numbers
03.01.2016 MRO sees Frosty Spring Slopes
02.12.2016 Women in Science
02.10.2016 Wind at Work
11.16.2015 Change Observed in Martian Sand Dune
10.05.2015 'The Martian' Story's Ares 4 Landing Site
10.05.2015 The Ares 3 Landing Site (Figure A)
09.30.2015 Avalanche Ho!
06.29.2015 Mars Exploration Zone Layout Considerations
06.17.2015 Active High-Latitude Dune Gullies
06.03.2015 Crisp Crater in Sirenum Fossae
05.20.2015 Sedimentary Rock Layers on a Crater Floor
05.20.2015 Honey, I Shrunk the Mesas
05.11.2015 Icy Wonderland
05.04.2015 Diverse Orbits Around Mars
03.27.2015 South Pole Spiders
03.27.2015 A Smile a Day....
03.25.2015 Pitted Landforms in Southern Hellas Planitia
03.12.2015 Curiosity Heading Away from 'Pahrump Hills'
02.18.2015 Lava Flow Near the Base of Olympus Mons
02.09.2015 Yardangs in Arsinoes Chaos, Mars
02.04.2015 Curiosity Rover at 'Pahrump Hills'
01.22.2015 Frost on Crater Slope
Erosion Patterns May Guide Mars Rover to Rocks Recently ExposedImages of locations in Gale Crater taken from orbit around Mars reveal evidence of erosion in recent geological times and development of small scarps, or vertical surfaces. These two images come from the High Resolution Imaging Science Experiment (HiRISE) camera on NASA's Mars Reconnaissance Orbiter.
The image on the left shows the Yellowknife Bay area examined by NASA's Curiosity Mars rover during the rover's first 11 months on Mars. The red arrow points to the contact between the Sheepbed and Gillespie geological members. The blue arrow points to the contact between the Gillespie Lake member and overlying Glenelg member, which also forms a small scarp. These two geological contacts form scarps due to variations in rock hardness as eroded by the wind. The effect is to generate rock exposures that are relatively youthful in a geological timescale, on the order of 70 million years.
The image on the right shows the KMS_9 area, which Curiosity may investigate on the rover's route to Mount Sharp. The purple arrow points to the contact between the lowermost striated unit and the middle bedded unit. The yellow arrow marks the contact between the middle bedded unit and the upper smooth hummocky material. It is possible that the rocks adjacent to these scarps have also been only recently exhumed and exposed due to wind erosion.
The left image is a portion of HiRISE observation ESP_028335_1755, taken on Aug. 12, 2012. Other image products from this observation are available at http://www.uahirise.org/ESP_028335_1755 . The right image was taken on Aug. 9, 2010, and other products from the same observation are available at http://www.uahirise.org/ESP_018920_1755 .
Image Credit: NASA/JPL-Caltech/Univ. of Arizona