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Chockstone Forum - General Discussion

General Climbing Discussion

Topic Date User
Anyone know about the block coming off Odin? 31-Jul-2017 At 2:09:21 PM One Day Hero
Message
On 30/07/2017 Olbert wrote:
>So apart from needing a good edit, they suggested cleaning up Frog cracks
>so there were no more loose blocks. Crags generally exfoliate, at a greater
>or lesser pace.

One of the few things which I remember from 1st year geology was the lesson on mineral decomposition. Quartz sandstone is pretty chemically stable, whereas many volcanic rocks contain minerals which readily decompose once exposed to the atmosphere.

There's a fantastic road cutting near Wollongong which exposed a volcanic dyke intruded into the choss sandstone. Even though the unweathered volcanic rock is much stronger, in the 100 or so years since the cutting was made it has eroded back half a meter further than the surrounding sandstone. Chemical weathering trumps physical weathering (unless glacier or something)

>it is an unrealistic
>idea.

I agree to a certain extent, but also think that local climbers might want to keep an eye on things and make judgement calls. If a big flake or block is liable to come off under body weight, the climb is pretty fuched anyway. Bite the bullet and trundle, history be damned.

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