There is a fault in this climb: Llanberis Slate

Slate climbing is all about good small edges and tenuous smears. But Gadaffi Duck in the Looning the Tube sector of Australia Hole has a particularly slippery right wall for the start. The green mineral lining the right wall is fibrous epidote, and all the fibres point straight down, giving you nothing for your feet.
This is a fault plane and the fibres align in the direction of motion of the fault, with the (missing) block on the left moving down relative to the block on the right. I guess is the motion on the fault had been in the opposite direction the climb would be one or two grades easier!

[@hypnoshu]

Take me to the fields plz😁

[@OneMinuteGeology]

I do offer guided geology days in the UK. Are you UK based?

[@mikelong9638]

Are these slickensides, or something a litlle different?

[@OneMinuteGeology]

They are a type of slickenside (or in modern terminology fault-plane lineations - I prefer the old slickenside). There are two main types of FPL - aligned crystals and gouge-type FPLs. These are aligned crystals, which have the sense of roughness as described here. The gouge-type FPLs have the opposite sense of roughness (and since slickenside means 'polished surface' in the original German) they are possibly 'true slickensides'. So you have to be a little careful when determining fault kinemantics from these features. As always, it is a bit more complex....

[@GusRojas-s1h]

Thanks ,Doctor

[@GusRojas-s1h]

Thank you, for today lesson.