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broganadams
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Sep 9, 2001, 7:46 AM
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I would like to have another rock type added. I would like it to be "tuff" that is what the rock at Smith Rock is called. It is a fused volcanic ash. The closest thing we have is volcanic and when you think of volcanic you think that really sharp rock that can bust of in your hand. I wouldn't like people that have never visited there to get the wrong impression.
Brogan
[ This Message was edited by: trevor on 2001-09-09 14:26 ]
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trevor
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Sep 9, 2001, 9:29 PM
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I don't have a problem with this. I've just never heard this before. Can someone verify this?
I'll add it as soon as I get verification.
Maybe we should consider having someone write an article about the various rock types. I think it would be an interesting discussion. It may help people classify rock types more accurately. Any volunteers??
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kriso9tails
Sep 9, 2001, 11:38 PM
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Tuff or tufa is a proper term. It will be in most dictionaries and many sites on the net if you need any specific definitions or documented textual verification.
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marcsv
Sep 10, 2001, 2:44 AM
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volcanic tufa (tuff) is a porous rock (sometimes called adobe). its not so much as fused ash, but active volcanic activity or origin is required to have this type of rock formation. what's amazing about this type of rock is that when its dry it is used as building material for colonial churches. but when its wet dare not climb one because even the slightest pressure could break it.
because its volcanic in origin expect to find basalt rock formations, in some cases, basalt is found imbedded in tufa. the general texture of tufa would vary according to the area.
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talons05
Sep 10, 2001, 2:49 AM
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I would like to have the rock-type "manky-breakable-stuff" added so that I can describe a few routes I've been on.
[ This Message was edited by: broganadams on 2001-09-09 21:19 ]
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talons05
Sep 10, 2001, 2:51 AM
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Oh, and my climbing partner was taking a geology class a while back, so all I heard about while we were climbing was what kind of rock it was. I have definitely heard of Tuff or Tufa. (He called it Tufa)
AW
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trevor
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Sep 11, 2001, 5:53 AM
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I added Tufa to the list of Rock types. I still think we need a Rock type article. Any volunteers?
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dongonthier
Aug 1, 2002, 2:37 AM
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Actually you've still got it wrong. Tufa is a type of calcium carbonate rock, think caves, stalagmites, stalagtites and flow stone. Welded Tuff is a completely diferent type of rock. It is formed during very large volcanic eruptions when large clouds of hot ash weld together after coming to a rest. It usually has a similiar chemical composition to rhyolite or granite. Much of central and eastern Oregon are covered by the stuff, somtimes thousands of feet deep. Smith Rock is only one of those areas.
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