Thursday, February 25, 2010

New Martian Pics: Pasteur Crater

Posted By on Thu, Feb 25, 2010 at 4:28 PM

PSP_001756_1995.jpg
  • NASA/JPL/University of Arizona

A new batch of photos from the HiRISE camera aboard the Mars Reconnaissance Orbiter are up.

HiRISE team member Colin Dundas tells us:

This observation shows a portion of the central sedimentary deposits in Pasteur Crater.

The deposits in this image now being eroded into knobs and ridges. The erosion is probably dominated by wind, as most of the ridges are parallel. This is common in wind-eroded features, with the ridges generally aligned with

the prevailing wind.

At high resolution, layering is revealed in many of the knobs and outcrops. The horizontal layers indicate that the material was deposited uniformly over a broad area. Possible origins include volcanic airfall or lacustrine (lake) deposits. After deposition, the rock in this area has been fractured and faulted, forming a diverse array of cracks.

The mottled appearance of much of the image is caused by dark, featureless patches which may be wind-blown dust. These have interacted with lighter-toned ridges and ripples which are probably also formed by aeolian (wind) processes. In places, the dark patches partially cover the ripples, indicating that they have moved more recently, but they must be thin because the ripples frequently stand above surrounding dark material.

The ripples exhibit multiple interacting orientations in some places, producing networks of small ridges which reflect movement in winds from several directions.

Tags: , ,

Comments

Subscribe to this thread:

Add a comment

Previously in the Range

More by Jim Nintzel

  • Editor's Note: South By South Wiped

    I'm still a little jangled from spending five days trying to drink from the sonic fire hose that is SXSW...
    • Mar 21, 2019
  • Editor’s Note: Rays of Sunshine

    It's Sunshine Week, which doesn't just mean another week of gorgeous weather here in Southern Arizona. It's also the week when the press points out the importance of having access to public records.
    • Mar 14, 2019
  • Editor's Note: Scam Alert

    This week, staff reporter Kathleen Kunz exposes some of the scams happening in our community.
    • Mar 7, 2019
  • More »
Today | Sun | Mon | Tue | Wed | Thu | Fri
Meditation and Buddhist study

Meditation and Buddhist study @ Sky Island Zen

Tuesdays, Saturdays

All of today's events | Staff Picks

Staff Pick

Carnival of Illusion: Magic, Mystery & Oooh La La!

This top-rated illusion show is "Revitalizing Magic" by blending an international travel theme with all the charms… More

@ Scottish Rite Grand Parlour Saturdays, 7:30-9 p.m. Continues through April 27 160 South Scott Ave

» More Picks

Submit an Event Listing

Popular Content

  1. 19 Great Things to Do in Tucson This Weekend: March 22 to 24 (The Range: The Tucson Weekly's Daily Dispatch)
  2. "Electrical Hypersensitivity" to be Discussed at Films Screenings around Tucson (The Range: The Tucson Weekly's Daily Dispatch)
  3. XOXO: Where to Rock This Weekend, March 22 to 24 (The Range: The Tucson Weekly's Daily Dispatch)
  4. Laughing Stock: What Will Millennials Do? (The Range: The Tucson Weekly's Daily Dispatch)
  5. Claytoon of the Day: The Conway Mood Killer (The Range: The Tucson Weekly's Daily Dispatch)

© 2019 Tucson Weekly | 7225 Mona Lisa Rd. Ste. 125, Tucson AZ 85741 | (520) 797-4384 | Powered by Foundation