In this article blind climber Red Szell recounts his ascent of the iconic seastack of The Old Man of Hoy, one of Britain's most famous rock climbs.
"The fourth pitch was like a geology lesson, my fingers spoilt for choice with the different textures in the beautifully stratified wall that included arcs of rock-iron, as if someone had buried sections of iron drainpipe amid the sandstone, and which provide the best side-pulls known to mankind..."
Read more at http://www.ukclimbing.com/articles/page.php?id=5602