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Friday Field Photo #182: Stretched-pebble conglomerate

April 19, 2013

stretched pebble conglomerate

This week’s photo is from Panamint Valley in southeastern California (the valley to the west of Death Valley). This example of a stretched-pebble conglomerate is actually a boulder in a wash and not in place. Therefore, I’m not exactly sure of it’s age, but it’s likely from the Proterzoic Kingston Peak Formation, which crops out in the Panamint range. It’s pretty awesome to think about pebbles in a conglomerate getting deformed and stretched like this.

Happy Friday!

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9 Comments leave one →
  1. April 19, 2013 10:37 pm

    I understand it is indeed from the Kingston Peak formation.

  2. Gary permalink
    May 21, 2013 11:12 am

    Yes, I have seen this in the Precambrian of eastern Manitoba in the Bird River Greenstone Belt of the Canadian Precambrian Shield. It is a volcanic conglomerate with dominant sub-volcanic clasts with interbedded turbidite and greywacke (mud ) intervals. Going east into Ontario, the metamorphic grade goes from upper greenschist to amphibolite facies and the clasts are gradually stretched so badly that they form a gneissic textured rock that they call it a paragneiss!

    • bill turnbull permalink
      May 22, 2013 7:57 am

      Gary, are you saying it’s the same deposit or an analagous deposit in Manitoba?

      Panamint is one maountain range to the east of me, counts as right in my back yard in these parst, pretty cool, no?

    • Gary Posehn permalink
      May 22, 2013 10:35 am

      Definitely not, but it is interesting to see similar processes in different parts of geologic provinces and ages!

      Gary

    • bill turnbull permalink
      May 27, 2013 9:44 am

      Thanks for the clarification, I would have been much surprised, in my ->amateur<-, opinion if they were that same formation.

  3. bill turnbull permalink
    June 3, 2013 7:11 am

    I have an e-mail in my inbox this morning purporting to be a reply from a “Ken Bateman” on this article with a link to a crank young-earther web page. The subject is “Do stretched-pebble conglomerates happen quickly or slowly?”. I notice that his article doesn’t allow for commenting, typical cowardly creationist post, disable all ratings and comments, because someone may apply actual reasoning to your “argument”.

  4. June 3, 2013 7:21 am

    Bill … I put that comment in spam this morning. It no longer shows up on this post (or the several other posts they spammed with their ‘Does _____ happen quickly or slowly?’ tagline). I’m way too busy to deal with trolls/spammers, I just simply trash their comments and move on with my day.

    • bill turnbull permalink
      June 3, 2013 7:31 am

      No reply required, many thanks. I have no doubt that his comment was of the same quality as the arguments I have seen that the Hamalayas have risen in the last 6,000 years, or less, > 1 meter/year, yah you becha. The twisty arguments that they resort to to try to back-fit the evidence to their stories is incredible.

  5. June 3, 2013 7:46 am

    Bill … and I should say thank *you* for commenting here and having a genuine interaction with another reader. I always like it if my photos spark some good discussion among readers.

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