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Big Bend Virtual Geology Field Trips

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Offline SA Bill

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  • 1992
Re: Big Bend Virtual Geology Field Trips
« Reply #15 on: July 12, 2015, 07:57:21 PM »
Francis Redfern, you are a rock star!

Groan!  :eusa_doh:

Yes...it is very gneiss of FR to make these available. Thx FR!  :notworthy:
  Ducking for cover,
    Bill
Bill - In San Antonio

Growing old is mandatory.
Growing up is optional.

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Offline Francis Redfern

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Re: Big Bend Virtual Geology Field Trips
« Reply #16 on: July 20, 2015, 01:09:47 PM »
I have updated several more field trips using the new USGS map: Dodson II, Estufa Canyon, Basin, and South Rim Trail. (Congress! Don't cut the USGS budget!)

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Offline iCe

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Re: Big Bend Virtual Geology Field Trips
« Reply #17 on: July 21, 2015, 05:55:05 AM »
One of my favorite websites! Thanks for the updates

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Offline Francis Redfern

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Re: Big Bend Virtual Geology Field Trips
« Reply #18 on: July 22, 2015, 07:19:29 PM »
Just updated the Dog Canyon trip using the new USGS map.

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Offline Francis Redfern

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Re: Big Bend Virtual Geology Field Trips
« Reply #19 on: July 24, 2015, 03:23:04 PM »
Just revised the Mule Ear Peaks feature. Sure wish i had the new USGS map back in the day!

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Offline ds9writer

  • Diamondback
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Re: Big Bend Virtual Geology Field Trips
« Reply #20 on: July 24, 2015, 06:37:02 PM »
Francis Redfern, you are a rock star!

Groan!  :eusa_doh:

Yes...it is very gneiss of FR to make these available. Thx FR!  :notworthy:
  Ducking for cover,
    Bill


I was trying to think of some comment for this, but it's tuff.  My dome wasn't working very well and all my ideas were schist.  Hope I don't cause a rift w/ this...
You don't travel to see different things,
You travel to see things differently.

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Offline SA Bill

  • Mountain Lion
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  • 1992
Re: Big Bend Virtual Geology Field Trips
« Reply #21 on: July 24, 2015, 06:49:54 PM »
Ha Ha Ha!!  :icon_lol:
  Bill
Bill - In San Antonio

Growing old is mandatory.
Growing up is optional.

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Offline iCe

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Re: Big Bend Virtual Geology Field Trips
« Reply #22 on: July 25, 2015, 10:55:42 AM »

I could find no fault in this statement  :)

I was trying to think of some comment for this, but it's tuff.  My dome wasn't working very well and all my ideas were schist.  Hope I don't cause a rift w/ this...

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Offline ds9writer

  • Diamondback
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  • 449
Re: Big Bend Virtual Geology Field Trips
« Reply #23 on: July 25, 2015, 03:05:20 PM »

I could find no fault in this statement  :)

I was trying to think of some comment for this, but it's tuff.  My dome wasn't working very well and all my ideas were schist.  Hope I don't cause a rift w/ this...

Knew I'd missed a few good terms!    :icon_lol:
You don't travel to see different things,
You travel to see things differently.

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Offline Francis Redfern

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Re: Big Bend Virtual Geology Field Trips
« Reply #24 on: July 27, 2015, 02:01:41 PM »
The USGS has made an important change in the geological interpretation of Persimmon Peak, and i have had to make significant changes to the Marathon and Persimmon Gap field trips.

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Offline RichardM

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Re: Big Bend Virtual Geology Field Trips
« Reply #25 on: July 27, 2015, 02:47:56 PM »
The USGS has made an important change in the geological interpretation of Persimmon Peak, and i have had to make significant changes to the Marathon and Persimmon Gap field trips.
My father loves to tell of the time he was on a geology field trip while a student at the University of Texas back in the 1950's. The two professors leading the trip nearly came to blows while discussing the Persimmon Gap geology, as each was convinced the other was wrong.

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Offline Flash

  • Mountain Lion
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  • 1947
Re: Big Bend Virtual Geology Field Trips
« Reply #26 on: July 27, 2015, 02:57:12 PM »
Dr. Redfern:

I am thinking about starting an "Ask a Geologist" thread where folks can post a picture and the resident geologists can take a stab at explaining what it is or what might be going on. Would you be interested in participating as time permits and/or you feel so inclined?  :eusa_think: 

Thanks,

Flash

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Offline Homer Wilson

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Re: Big Bend Virtual Geology Field Trips
« Reply #27 on: July 27, 2015, 05:34:50 PM »
I'm looking forward to the persimmon gap trip. In January, I had a geologic map... And two geologists with me on the persimmon gap trail, and I still had no idea what was going on.

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Offline Francis Redfern

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Re: Big Bend Virtual Geology Field Trips
« Reply #28 on: July 27, 2015, 10:13:13 PM »
Can we please stifle the awful puns?  ;-) . However, i must admit i'm guilty too. I would introduce my students to metamorphic petrology by holding up one rock and saying, "This rock is gneiss." Then i would hold up another and say, "But this rock is a piece of schist.". If that wasn't bad enough, once a student doing a historical geology exercise wrote, "Schist occurs." I told him that was absolutely wrong. "Everyone knows schist happens.."

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Offline Flash

  • Mountain Lion
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  • 1947
Re: Big Bend Virtual Geology Field Trips
« Reply #29 on: July 27, 2015, 10:19:12 PM »
Dr. Redfern:

I am thinking about starting an "Ask a Geologist" thread where folks can post a picture and the resident geologists can take a stab at explaining what it is or what might be going on. Would you be interested in participating as time permits and/or you feel so inclined?  :eusa_think: 

Thanks,

Flash

Take this for example. It is the lowest most of the pinnacles on the Pinnacles Trail accessible via short social trail at the end of one of the switchbacks. But is it really one of the pinnacles? To me it seems an entirely different sort of rock, if not sedimentary, them metamorphic? Assuming it were sedimentary, based on the size of those clasts, would I call it a cobble breccia? But is igneous, are those gigantic mineral crystals such as orthoclase? Please forgive this petroleum engineer, if I have butchered my long dormant nomenclature.

Side of the pinnacle


Close up of the very angular cobbles


Another shot close up


Thanks,

Flash

 


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