Geology Quiz

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dipper

climber
Topic Author's Original Post - Dec 31, 2009 - 10:15pm PT
I am diggin all the rock talk.

I used to climb with geology students and they would enlighten me as to what I was jamming and and lay-backing off of.

So have at it with this image.

What is going on here?


Shack

Big Wall climber
Reno NV
Dec 31, 2009 - 11:10pm PT
Obviously horizontal stratification of post metasedimentary...
oh, never mind, I have no idea.

Bryan?
The Mr. Ben

Social climber
Boston
Dec 31, 2009 - 11:27pm PT
Could be a calcite deposit. If so, lenticular deposits such as this often occur in marine depositional environments, if that rock is limestone. If not, it could be secondary (i.e., water leaks through cracks in the rocks and precipitates out dissolved calcium). My hunch is #1.
Anastasia

Mountain climber
hanging from a crimp and crying for my mama.
Dec 31, 2009 - 11:33pm PT
I'm guessing...
I think that is an iron deposit on top getting all rusted and quartzite in the middle.
Am I right or did I fail gloriously?
:)AFS



dipper

climber
Topic Author's Reply - Dec 31, 2009 - 11:54pm PT
More data for the armchair rock-hounds

taorock

Trad climber
Okanogan, WA
Dec 31, 2009 - 11:56pm PT
lenticularite in laminated intercoursite?
Ihateplastic

Trad climber
Lake Oswego, Oregon
Jan 1, 2010 - 12:01am PT
uh..huh, huh... you said intercoursite!
taorock

Trad climber
Okanogan, WA
Jan 1, 2010 - 12:10am PT
I did - whoops. Old geo joke - another fcuking rock.

Must really be quartz in metasediments.
dipper

climber
Topic Author's Reply - Jan 1, 2010 - 02:01am PT
Some context for those interested


Mungeclimber

Trad climber
sorry, just posting out loud.
Jan 1, 2010 - 02:11am PT
I have no idea what it is.

The real question is how does it boulder?
Curt

Boulder climber
Gilbert, AZ
Jan 1, 2010 - 02:12am PT
Looks like petrified wood.

Curt
LuckyPink

climber
the last bivy
Jan 1, 2010 - 02:14am PT
haha.. just as I thought

"choss pile"
dipper

climber
Topic Author's Reply - Jan 1, 2010 - 02:14am PT
In general, it is as stable as cheap styrofoam. The stuff in the first 2 shots is pretty stable though.
Mighty Hiker

climber
Vancouver, B.C.
Jan 1, 2010 - 02:17am PT
http://supertopo.com/climbers-forum/1018638/What_IS_it_about_choss
dipper

climber
Topic Author's Reply - Jan 1, 2010 - 02:44am PT
Even more context here

Bill Mc Kirgan

Trad climber
Cedar Rapids, Iowa
Jan 1, 2010 - 12:42pm PT
big a** chert nodule ?
cintune

climber
the Moon and Antarctica
Jan 1, 2010 - 02:26pm PT
taorock got it, at least from the looks of it: massive "bull" quartz in lenses and irregular layers, originally deposited deep down in some kind of silt that meta'd to schist.
At least that's what it looks like.
Happy New Year, rockhounds.
Mighty Hiker

climber
Vancouver, B.C.
Jan 1, 2010 - 02:31pm PT
I think I can see the face of Sir Francis Drake in that formation...

Point Reyes has some interesting geology.
Jaybro

Social climber
Wolf City, Wyoming
Jan 1, 2010 - 04:51pm PT
The steinmen trinity?
Minerals

Social climber
The Deli
Jan 1, 2010 - 05:45pm PT
I deleted my bad joke…


Quartzite or quartz vein? There IS granite nearby…

Depositional lens or tectonic lens?

That ain’t Franciscan… And it’s moving!


Geology of Point Reyes:

http://www.sfsu.edu/~geog/bholzman/ptreyes/introgeo.htm



More geo quizzes, please!!! :)


(Edit: Damn link......)


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