2015-05-12 11:47 GMT+02:00 Martin Koppenhoefer <dieterdre...@gmail.com>:
> FWIW, pebbles seem to be a subset of gravel (grain size): > > granular gravel (2 to 4 mm) > pebble gravel (4 to 64 mm) > to complete this for our purposes: below granular gravel there is sand, above pebble there are cobbles (64 - 254mm diameter). Cheers, Martin
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