Space/Science » in reply to Re: Meridiani Crater

You may be on to something, BR.

Marcia — 8/9/2002 5:02:15 PM (archived)

Earth's Richat Structure, Ouadane, Mauritania

21°04'N, 11°22'W; outer ring diameter: 38 km
Age: unknown

This prominent circular feature in the Sahara desert of Mauritania was initially interpreted as a meteorite impact structure because of its high degree of circularity and multiple ring configuration. Further investigation has shown that the structure probably formed by uplift and erosion of a sequence of sedimentary rocks, creating the series of annular rings, with the harder quartzites of the sequence forming ridges and the softer rocks eroding to form the intervening depressions. Despite thorough investigations, no traces of shock metamorphism or meteoritic signatures have been found at the structure. (Space shuttle photograph STS37-98-69.)

http://cass.jsc.nasa.gov/pub/publications/slidesets/impacts.html

Marcia
-I was going to 'guess' that it was a cometary impact.

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The whole thread (33 posts)

• MGS MOC Releases MOC2-316 to MOC2-319, 8 August 2002 - Alex R. Blackwell - 8/8/2002 5:48:29 PM
  • Re: Inca City - BRFelix - 8/8/2002 7:43:32 PM
    • Re: Inca City - Robert E. B. - 8/8/2002 7:53:07 PM
      • Re: Fractures... except that the Inca City formation - BRFelix - 8/8/2002 3:08:46 PM
        • Re: Fractures... except that the Inca City formation - Robert E. B. - 8/9/2002 7:20:12 PM
          • Which is precisely what the MSSS caption implies - Alex R. Blackwell - 8/9/2002 7:51:55 PM
            • Who wants to read the caption :) - Robert E. B. - 8/12/2002 1:14:02 PM
          • Re: Could be... - BRFelix - 8/9/2002 12:55:39 PM
            • Your eyesight must be incredible - Alex R. Blackwell - 8/9/2002 1:15:22 PM
              • Re: Nah... just asking questions, boss - BRFelix - 8/10/2002 3:15:42 PM
                • My Reviewers... - Nick Hoffman - 8/10/2002 5:16:02 PM
                  • Re: So um, could it be that some (or even much) - BRFelix - 8/10/2002 7:27:17 PM
                    • Re: So um, could it be that some (or even much) - Robert E. B. - 8/12/2002 2:19:09 PM
                    • Age and Scale - Nick Hoffman - 8/10/2002 11:00:08 AM
                      • Re: Age and Scale - BRFelix - 8/11/2002 5:53:50 PM
        • Does anyone know (Alex, especially)... - alcaray - 8/9/2002 6:02:47 PM
          • Mars Express MARSIS - Alex R. Blackwell - 8/9/2002 7:06:26 PM
  • Re: MGS MOC Releases MOC2-316 to MOC2-319, 8 August 2002 - Robert E. B. - 8/8/2002 6:39:10 PM
  • Re: Meridiani Crater - BRFelix - 8/8/2002 11:38:13 AM
    • You may be on to something, BR. - Marcia - 8/9/2002 5:02:15 PM
      • The Richat Structure - Marcia - 8/9/2002 5:33:24 PM
        • Re: Jeepers! - BRFelix - 8/9/2002 6:29:42 PM
          • Could be an eroded dome. - Robert E. B. - 8/9/2002 7:15:20 PM
            • The stereo anaglyph shows it to be a depression - Alex R. Blackwell - 8/9/2002 7:41:31 PM
              • Re: The stereo anaglyph shows it to be a depression - Robert E. B. - 8/9/2002 7:48:59 PM
              • Oops, a fingerfehler - Alex R. Blackwell - 8/9/2002 7:45:36 PM
              • Re: The stereo anaglyph shows it to be a depression - Robert Clark - 8/9/2002 9:31:00 AM
                • Re: Interesting, interesting - BRFelix - 8/9/2002 11:10:12 AM
              • Re: could be the circular pits associated with the Meridiani - BRFelix - 8/9/2002 8:27:21 AM
            • Interesting. - Marcia - 8/9/2002 7:41:08 PM
  • Thanks Alex - Vince - 8/8/2002 8:20:07 AM
    • THEMIS VIS "color" imagery - Alex R. Blackwell - 8/8/2002 10:57:04 AM
      • Imagery - E.P. Grondine - 8/9/2002 3:32:43 PM