weird geology on Google Earth

Grab your bear can or camp chair, kick your feet up and chew the fat about anything Sierra Nevada related that doesn't quite fit in any of the other forums. Within reason, (and the HST rules and guidelines) this is also an anything goes forum. Tell stories, discuss wilderness issues, music, or whatever else the High Sierra stirs up in your mind.
Post Reply
User avatar
SSSdave
Topix Addict
Posts: 2541
Joined: Thu Nov 17, 2005 11:18 pm
Experience: N/A
Location: Silicon Valley
Contact:

weird geology on Google Earth

Post by SSSdave » Thu May 31, 2018 10:29 pm

I was exploring around with Google Earth 3D south of Pinchot Pass and came across some weird geology I am wondering what the heck this mystery is???

Some others here into our rock sciences will no doubt be amused too and maybe have an explanation. This is at 36d 55m 23.58s N 118d 24m 71 W at elevation 11822 feet in metamorphic rock. At first I thought it was just some vegetation, maybe moss pattern or erosion layers, however it shows up in all the historical dates thus must be rock. Then noticed the slope above seemed to be glacial polished so wonder if it might be a thin layer of some type of mineral deposition the glacial went over? Or maybe glacially polished limestone?

Since I've queued up a trip over Taboose for this August, there is a good chance I am going to find out.
weird-geology.jpg
You do not have the required permissions to view the files attached to this post.








User avatar
dapperdave
Topix Acquainted
Posts: 61
Joined: Tue Aug 28, 2012 2:07 am
Experience: Level 4 Explorer

Re: weird geology on Google Earth

Post by dapperdave » Fri Jun 01, 2018 2:59 am

Dave
Looks like vegetation, on sediment in a dry seasonal pond to me.
Topographically, it's not likely to be bedrock.
Cr.JPG
You might find this interesting

http://geomaps.geosci.unc.edu/quads/ful ... inchot.jpg

My bet is on Pzch Calc-Hornfels as the source of the Emerald pools. Maybe finely divided Alumino-silicates and Talc?

Dave
You do not have the required permissions to view the files attached to this post.

User avatar
SSSdave
Topix Addict
Posts: 2541
Joined: Thu Nov 17, 2005 11:18 pm
Experience: N/A
Location: Silicon Valley
Contact:

Re: weird geology on Google Earth

Post by SSSdave » Fri Jun 01, 2018 2:30 pm

Thanks dave for your educated input. On closer map examination this is at 11790 feet or 3590 meters. On GE it is right at the boundary seam of brown and white and strata that I've circled in magenta. The same structure does not show low down anywhere on that seasonal stream ravine. The geology map shows the white strata to probably be Paleozoic Pzch and the brown strata Pzbs. However not far away is Pzm, marble, so this might be a small chunk of that since it is down lower in the ravine.

Pzch = Calc-hornfels
Pzbs = Biotite schist
Pzm = Marble

Will be interesting to actually check this out. The reason I didn't think it was vegetation was it is identical on all the historical GE maps before the current one that might be odd if it were organic. And if it was sediment then why has it stayed the same for over a decade?

And you added in a hunch about the emerald pools presumably those over near east Arrow Peak basin. That is another place I plan to camp near for a day. Map shows Kgd, Goodale pluton though not identified on the map labels.

geo-map-weird.jpg
You do not have the required permissions to view the files attached to this post.

User avatar
dapperdave
Topix Acquainted
Posts: 61
Joined: Tue Aug 28, 2012 2:07 am
Experience: Level 4 Explorer

Re: weird geology on Google Earth

Post by dapperdave » Wed Sep 12, 2018 5:24 am

Hi Dave, did you manage a field visit?

Dave

User avatar
SSSdave
Topix Addict
Posts: 2541
Joined: Thu Nov 17, 2005 11:18 pm
Experience: N/A
Location: Silicon Valley
Contact:

Re: weird geology on Google Earth

Post by SSSdave » Wed Sep 12, 2018 6:39 pm

Not this summer, as all the smoky fires had me cancelling trips during the August period I might have gone up there.

User avatar
tomba
Topix Regular
Posts: 286
Joined: Sat Jun 18, 2011 12:50 pm
Experience: Level 4 Explorer
Location: Bay Area

Re: weird geology on Google Earth

Post by tomba » Sat Dec 01, 2018 12:15 pm

It looks similar to this:
segmented-lake-ge.jpg
DSC09030-segmented-lake-crop.jpeg
You do not have the required permissions to view the files attached to this post.
-- Found trash? Please pack it out. Thank you.

User avatar
dapperdave
Topix Acquainted
Posts: 61
Joined: Tue Aug 28, 2012 2:07 am
Experience: Level 4 Explorer

Re: weird geology on Google Earth

Post by dapperdave » Sun Dec 02, 2018 4:46 am

Nice piece of "ground-proofing" Tomba

Dave

User avatar
mokelumnekid
Topix Expert
Posts: 469
Joined: Mon Sep 22, 2008 4:45 pm
Experience: N/A
Location: Seattle
Contact:

Re: weird geology on Google Earth

Post by mokelumnekid » Tue Dec 04, 2018 11:58 pm

I've looked at a lot of metamorphic rock in the Sierra and elsewhere and haven't seen anything like this. I'm guessing that it is a surface feature, not a bedrock feature (I'm a practicing geologist). When you have so many contacts in a complex structural arrangement, groundwater flow and seeps can pop out about anywhere and be quite persistent. Ping Giant Brookie and ask him what he thinks.

User avatar
tomba
Topix Regular
Posts: 286
Joined: Sat Jun 18, 2011 12:50 pm
Experience: Level 4 Explorer
Location: Bay Area

Re: weird geology on Google Earth

Post by tomba » Sat Dec 08, 2018 7:05 pm

Here is another one. A surface feature made of grass and ponds. Click to enlarge.
DSC14991-segmented-lake-crop.jpeg
DSC14947-grass-dam.jpg
DSC14950-grass-dams-crop.jpg
You do not have the required permissions to view the files attached to this post.
-- Found trash? Please pack it out. Thank you.

Post Reply

Who is online

Users browsing this forum: No registered users and 0 guests