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Author Topic:   Young earth explanations for Angular Unconformities
petrophysics1
Inactive Member


Message 17 of 202 (351495)
09-22-2006 10:24 PM
Reply to: Message 16 by Jazzns
09-20-2006 12:14 PM


Re: Bump for Geologists
The Pennsylvanian Fountain formation lies on precambrian igneous and metamorphic rock west of Denver, a nonconformity. Excellent place to look at that contact is in Red Rocks Park. Further to the east the Pennsylvanian is deposited on top of Mississippian rocks and there is a disconformity, with the Missippian showing a weathered upper surface and a paleosoil. These rocks are in the subsurface so you can't directly look at them. I know this from dipmeter and formation microimaging data and I also cored it when I worked for Phillips Petroleun in the 80s.

Here is a link to a angular unconformity to nonconformity in California.

http://www.marin.cc.ca.us/~jim/ring/ptreyes/pr_ang.html

Some angular unconformity pictures

shortened link

Edited by AdminJar, : No reason given.


This message is a reply to:
 Message 16 by Jazzns, posted 09-20-2006 12:14 PM Jazzns has replied

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petrophysics1
Inactive Member


Message 133 of 202 (796655)
01-02-2017 3:08 PM
Reply to: Message 126 by Percy
01-02-2017 8:12 AM


Edge's photo of the GC
Percy,

Google "spheroidal weathering images", now look at Edge's photo. The lower pinkish rocks are the granite, do you see the spheroidal weathering in the granite now? The granite was being weathered chemically but the weathered material was not being removed.

To weather a granite this deeply requires a substantial amount of time. It is an interesting photo because it is a picture of an unconformity that clearly shows a prolonged period of weathering before the later deposition. If everything weathered has been removed this is not as clearly shown.


This message is a reply to:
 Message 126 by Percy, posted 01-02-2017 8:12 AM Percy has replied

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 Message 134 by Percy, posted 01-02-2017 4:37 PM petrophysics1 has taken no action

  
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