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Some odd rock features were...

 
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Some odd rock features were...
Some odd rock features were found just west of Gunsight Pass. I have no idea. Anybody anybody? June 2002. Update, my friend Steve Nelson, a geologist, guesses that this might be either 1) acnecite or 2) sandstone or limestone with ferromanganite concretions. He leans toward the latter. For more info and possibilities, see the thread below...

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ScottIron conceretions

Scott

Hasn't voted

I believe those are iron concretions, which are present in quatzites and sandstones in the region. When an impurity is in the sandstone, iron particles are attracted to it. The iron concretions are more erosion resistant than the surrounding rock, so what is left it alot of weird dark-colored "bumps" in the rock.
Posted Oct 25, 2004 4:06 pm

KlenkeRe: Iron conceretions

Klenke

Hasn't voted

Thanks, Scott. Sounds good to me. Your analysis corroborates Steve's.
Posted Oct 25, 2004 7:55 pm

JonBradfordRe: Iron conceretions

JonBradford

Hasn't voted

Klenke,

There is one way to verify our speculation... got a magnet?

I would assume iron concretions as well but magnatism is a great indicator of iron content.

Jon
Posted Oct 25, 2004 10:05 pm

ScottRe: Iron conceretions

Scott

Hasn't voted

Nope, they don't stick to magnets. There's just some iron in the sand, not enough to stick to a magnet. I have some perfectly round concretions at my house, usually refered to as "Moki Marbles" in Utah.
Posted Oct 26, 2004 7:00 pm

mdurrantRe: Iron conceretions...Worm Castings

Hasn't voted

These are common in the Utah limestone formations. They are formed when the substrate was still soft by the organic rich worm dung. Many of these occur from the Bonneville Lake era.
Posted Jul 5, 2005 4:00 pm

ScottRe: Iron conceretions...Worm Castings

Scott

Hasn't voted

Looks like it, I would have to disagree. The core of the Uintas is made of precambrian quartzite about 1.3 billion years old. There is no limestone at all in the core of the Uintas, and I believe the age of the quartzite is much older than worms even existed.
Posted Jul 5, 2005 5:44 pm

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KlenkeSubmitted by Klenke
on Feb 6, 2004 2:20 pm

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Object Title: Some odd rock features were...