Cob: tabby ?

[John Fordice]

Go'day cobbers.
Here is a question to all.
I just this AM discovered this definition of "tabby" as a building material.
Sounds pretty local & natural to me.
I realize it's not cob, but thought it might be something the list might
like to chew on a bit.
So if anybody knows a bit about this, please share it to the list.
......
TABBY = (in the region of) South Atlantic U.S. -  A mixture of oyster
shells, lime, sand, and water
used as a building material.

regards to all

john fordice
TCCP