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Wednesday, April 15, 2009

Theory of anticlines

Stan checking "did I get that last shot?"

An anticline is a term used in structural geology to describe a fold in rocks that has an apex with the beds dipping down on either side. That is like an upside down "U". That's the opposite of a syncline which would be rocks folded like a right side up "U".

On our recent paddle out to the Iona Islands in Placentia Bay I captured Stan in front of an anticline in rocks of the Trinny Cove Formation. The Trinny Cove Formation is made up of red and greenish sandstones known as an "arkose". Arkose is a sandstone where 25% or more of the sand grains making up the sandstone are the mineral "feldspar". When you think about it, its hard to believe that something like stone would be plastic enough to bend like this.

Terms like arkose are a bit technical but the small anticline is clear to see in the rocks and you don't have to be a geologist to notice these kinds of structures on you paddles. Its all part of the environment we paddle in and adds to the interest of being out there.

Tony :-)

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