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Friday Field Foto #28: Thin-bedded turbidites

August 30, 2007


It’s not quite Friday yet, but close enough…15 minutes to go.

Check out these strikingly rhythmic turbidite beds. I’m not a fan of the term ‘rhythmites’ because that implies, to me anyway, that the deposits are the result of a rhythmic process. Just because the response appears rhythmic doesn’t mean that the process was.

Anyway, this is a pretty beautiful example of the expression of thin-bedded turbidites. This package is in between two very thick (>50 m) successions of coarse sand and some conglomerate beds (some individual beds getting up to ~8 m thick). These are so well exposed because this entire outcrop is along the coast and washed nicely by wave action.

This is up north of here near the town of Gualala (apparently Ron did some of his graduate work there…maybe we can bug him to post about that someday).

See all the Friday Field Fotos here.

The Jacob Staff (the “jake”) at right is 1.5 m tall.


4 Comments leave one →
  1. August 31, 2007 5:20 am

    That looks like Salt Point State Park, near Stump Beach. I’d put a GE placemark on it if I had time. Likewise, I’d like to make a blog post about it sometime. Unfortunately I’m about to head out on a Mineralogy field trip to the Black Hills, momentarily. I probably won’t get a chance to post anything in time for the carnival either, though I want to. Time flies when you’re having fun!


  2. August 31, 2007 9:46 am

    yep, that is Salt Point

    have fun in the Black Hills

  3. September 10, 2009 11:22 am

    Hi! I was surfing and found your blog post… nice! I love your blog. :) Cheers! Sandra. R.


  1. Theoretical Stratigraphy #2: Barrell and the Rhythms of Geologic Time « Clastic Detritus

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