[Therion] mud!

[Wookey]

On 2017-08-14 11:51 -0700, Rob Countess via Therion wrote:

> It would seem like a break in tradition to use a different symbol for mud. I've
> been surveying caves for 20 years with this symbol. As far as I understood, we
> were using British mapping symbols because of the large number of British
> cavers like Mike Boon and Tich Morris, and others who came over because of
> Derek Ford at McMaster University. I used to have a huge list of symbols with
> this mud symbol included, I can't find anything to back this up several pages
> deep on google. You will notice that the UIS calcite symbol is exactly the mud
> symbol in Canada whereas our calcite symbol is connected scallops. Not sure if
> this is based of some now defunct british symbols set.

You don't have to draw your caves with the UIS sysmbol set. You can
choose a different symbol-set if you prefer. As you say, the lack of a
'mud' sysmbol is a bit difficult for cavers of a UK mindset, but the
UIS logic in just defining sediments by particle size does make some
sense.

Therion is quite happy for you to specify any sysmbol set you like, or
to add a few extra sysmbols. (Most UK surveyors can't really get by
without the 'slope arrow' symbol for example)

Wookey
-- 
Principal hats:  Linaro, Debian, Wookware, ARM
http://wookware.org/
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