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Sony Forums Challenges | all galleries >> Challenge 52: Circles (hosted by MFC) >> Challenge 52: Exhibition Gallery > Circles in nature By Dave McMillan
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07-SEP-2002

Circles in nature By Dave McMillan

FujiFilm FinePix S602 Zoom
1/20s f/4.0 at 23.9mm iso200 full exif

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Sony Forums Challenges28-Sep-2003 06:41
Hi all, These are concretions which are formations in calsium rich sandstone where small objects like leaves or insect parts or whatever are trapped in sand and then over time (Thousands of years) this turns to sandstone. The imperfections create a focus for nodules of sand and calsium to form around. As erosion occurs the coccreted stone is tougher than the matrix so concretions can be seen. This particular one came from Anza borrego desert park just west of the Salton Sea in California.
Sony Forums Challenges28-Sep-2003 01:52
Very interesting subject matter Dave, and well-shot. What is that exactly? Melanie (mlynn)
Ann Chaikin27-Sep-2003 17:51
Good photo of our concretion Dave. I like the way you did the background. Pop would be proud. :) Ann
Sony Forums Challenges27-Sep-2003 07:12
Now this really caught my eye, Dave. This has to be voted the most unusual formation in the galleries :-) Mark J