29 October 2010
Friday fold: contorted Sivrihisar marble
Posted by Callan Bentley
Highly contorted laminations in a blueschist-grade marble, Sivrihisar massif, Turkey.
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Friday fold: contorted Sivrihisar marble7 Comments
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Friday fold: contorted Sivrihisar marble
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on 29 October 2010
Callan Bentley is Associate Professor of Geology at Piedmont Virginia Community College in Charlottesville, Virginia. He is a Fellow of the Geological Society of America. For his work on this blog, the National Association of Geoscience Teachers recognized him with the James Shea Award. He has also won the Outstanding Faculty Award from the State Council on Higher Education in Virginia, and the Biggs Award for Excellence in Geoscience Teaching from the Geoscience Education Division of the Geological Society of America. In previous years, Callan served as a contributing editor at EARTH magazine, President of the Geological Society of Washington and President the Geo2YC division of NAGT.
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Lovely photo of amazing folding, but PLEASE don’t use coins as a scale – I don’t know what coin that is and so have no idea if it is massive or tiny. For your field trips, you really should have a scale bar with both inches and centimetres shown (and measurement units clearly indicated, ie ‘ins’ and ‘cm’ so the casual viewer knows what is what.) Thanks.
Hi Sam,
Thanks for your comment. There have been others who have made a similar point. I like coins — especially if they reflect the country where the outcrop is. This is a Turkish 1-lira coin, and it’s the same size as a U.S. quarter. I also use a Swiss Army knife occasionally, and my fingers, which lack cm units in any kind of recognizable denotation. Oh well! I blame my genetics.
I hear your point, but I don’t think it’s of sufficiently high importance to sacrifice the aesthetic beauty of the coin or knife. Although…that may change.
C
Another example of this proud tradition.
Preferable scales:
Detailed photo – swiss knife or coin (It’s not really important for this kind of photos if the diameter is 2.1 or 2.84 cm!). BTW I use the local currency coins too
Outcrop photo – a beautiful girl 🙂
Cheers! 🙂
Beautiful. Did they interpret that as a sheath fold? A refolded sheath fold?
(I joked about doing a google image search for “folds” during structural geology exam review today, so if my students find this blog and read the comments: I’m not using this photo – it’s complicated!)
Hi Kim,
This is one I found on my own. “They” (the field trip leaders) weren’t explicitly into structure, and they basically turned us loose on the landscape at this location. Yes, I interpreted this (and others) as small sheath folds. This marble apparently turned to soup.
C
Well, coins, are always and almost of the same size, plus and minus of course, i have travelled many countries and have not come across any country has a coin of 2 inches, most coins are less than 2 inches. And i am amazed by the suggestion of a “massive” coin.