Carbonate concretions (1 of 2) by Dave Beedon

Dave Beedon | all galleries >> Places >> Utah >> Moab (environs) >> Negro Bill Canyon ("NBC") >> NBC Fins >> NBC Fins, River Overlook > Carbonate concretions (1 of 2)

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23-OCT-2006	Dave Beedon

Carbonate concretions (1 of 2)

Fin landscape above Negro Bill Canyon (near Moab, Utah)

How did the "balls" form? Why are they only here, on this narrow shelf atop a huge sandstone fin?

They are similar to hematite concretions, stone balls formed from minerals that
precipitated from flowing water. These, though, were most likely formed with
carbonate rather than hematite (evaluation provided by Marjorie Chan---thank you!).

The University of Utah has more information on marbles.
.

Nikon D80 ,Nikkor 20mm f/2.8 AF
1/500s f/7.1 at 20.0mm iso100 hide exif

Full EXIF Info
Date/Time	23-Oct-2006 12:12:57
Make	Nikon
Model	NIKON D80
Flash Used	No
Focal Length	20 mm
Exposure Time	1/500 sec
Aperture	f/7.1
ISO Equivalent	100
Exposure Bias	-0.67
White Balance
Metering Mode	matrix (5)
JPEG Quality
Exposure Program	manual (1)
Focus Distance

other sizes: small medium large auto

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Guest		17-Mar-2007 21:51
We find a simiilar thing is AZ, called a "desert rose" formed when lightening strikes sand. Could these have rolled down into this indentation from a higher strike point?

Guest		11-Mar-2007 11:24
The are found on Mars and called "blueberries" Dave.

1moremile		27-Jan-2007 00:59
Mountain oysters? Again, I've only heard of their existence.

kimberly borchardt		05-Jan-2007 20:55
weird. could be alien 'pods'.

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