Hi Bernard
Possibly half way there, but I await a report from my geologist friend
before I post.
Your comment on 'striations' is very relevant and should have indicated to
me the true nature of the beast.
The key to it all is that the country rock here is the Devils Bridge
Formation which is alternating layers of mudstone and sandstone.
I will give more on this in a later posting.
It interesting to observe that ones perspective on anything is to a large
degree a product of ones viewpoint, or the limitations of this. My picture
does not give much indication of the perspective; the height from floor to
timber is about 3 feet. Yes my 'tunnel' starts out at full walking height,
but at this point after about 140 feet decreases somewhat, a point made by
my geologist friend while lying on his back in water!
My point here is that it's rather difficult to get any impression at all of
the original passage.
It's all interesting stuff, and I know that many on this forum like to
follow my adventures.
Without going into detail at this time, I have another project on the go
now. It's breaking through at the end into what appears to be solid passage.
Here my analysis of the situation is correct in that it's not that at all.
It is actually a large, motor car size, chunk of rock that has fallen down
into the current position which corresponds with what one would perceive as
the roof of the continuation of the level. There are other boulders of
indeterminate stability, the breakthrough actually being into a small stope.
A luckless individual attempting to squeeze through at the end of my dig
could meet an untimely end. The mine has a gate on it that was not locked; I
have now fitted a padlock and chain for safety reasons until I have made the
situation safe.
My solution to the problem by the way, is to concrete it all as I drive
forward.
RF
-----Original Message-----
From: Bernard Moore [mailto:[log in to unmask]]
Sent: 27 April 2009 18:05
To: [log in to unmask]
Subject: Re: Slickensides
Dear Roy,
Not the end of the world... and it doesn't matter - apart from what height
it might have fallen from obviously!!!
My first impression was that it was 'fossilised water ripple marks' - have
seen plenty of these around this part of the world, but they were rather
larger than I have seen. Obviously the p.graph (though good and clear),
doesn't enable any 'striations' to be seen... but I have to say I have seen
some
pronounced slickensides before as well, but not often that rounded and
smooth.
Sounds as if that lump has come from a rather large void! - what is now
anyway!
Regards, Bernard
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