Id need some clarification. There are two commands for digging up clay. The from the sea shore requires you stand IN the water next to the pit. It was a trick to ensure the pit was actually at the shore.
A switch to "nearby tile" would also be a way to do that.
Okay relooked...
The pit can be made in any lake or river map and you stand ON the pit to simulate climbing into the pit, past the soil and vegatation layers
The seashore version is you go to a SEA map tile, getting wet, dangerous in the cold, by climbing into water to access the already exposed clay.
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diy_BAC_Earthenware
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.Dig clay. "Hunting Horn" [effort:2] [phys:arms,hands,stance] *WEATHERLORE* /1/ [noquality] [patch]
{[TERRAIN:lake river]} 'Lake or river (not rapids)'
{[TILE:Hole in the ground]} 'Pit for digging clay'
{Shovel}<Shovel>
[NAME:clay lump]
[MATERIAL:stone]
[WEIGHT:2]
[PRICE:0]
[TILEGFX:bc-clay]
.Dig clay from sea shore. "Hunting Horn" [effort:2] [phys:arms,hands,stance] *WEATHERLORE* /1/ [noquality] [patch]
{[TERRAIN:sea]} 'Sea shore'
{[TILE:Water]} 'Stand in water'
{Shovel}<Shovel>
[NAME:clay lump]
[MATERIAL:stone]
[WEIGHT:2]
[PRICE:0]
[TILEGFX:bc-clay]