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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Scott

Scott - Oct 25, 2004 4:06 pm - Hasn't voted

Iron conceretions

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.

Klenke

Klenke - Oct 25, 2004 7:55 pm - Hasn't voted

Re: Iron conceretions

Thanks, Scott. Sounds good to me. Your analysis corroborates Steve's.

JonBradford

JonBradford - Oct 25, 2004 10:05 pm - Hasn't voted

Re: Iron conceretions

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

Scott

Scott - Oct 26, 2004 7:00 pm - Hasn't voted

Re: Iron conceretions

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.

mdurrant - Jul 5, 2005 4:00 pm - Hasn't voted

Re: Iron conceretions...Worm Castings

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.

Scott

Scott - Jul 5, 2005 5:44 pm - Hasn't voted

Re: Iron conceretions...Worm Castings

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.

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