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I am also interested in this matter of shells (in general) used in construction. So if anyone has an answer, please send it to the list. Daniella Bar-Yosef Quoting Jill Hooper <[log in to unmask]>: > Does anyone have any reverences or ideas on the use of oyster shell used as a > building material in medieval/tudor times, i.e. pushed into mortar to level > up non uniform handmade bricks. > > Many thanks > Jill Hooper