John,
Don't know if this is helpful - it isn't flower pots. Linda Worthy talks
about depositional lag differences between porcelain, stoneware and
earthenware in the following article:

Worthy, Linda (1982) "Classification and Interpretation of Late-Nineteenth-
and Early-Twentiety-Century Ceramics" in Archaeology of Urban America: The
Search of Pattern and Process, ed. R.S. Dickens Jr., Academic Press, New
York: 329-360

Best of luck,
Susan Briggs

At 14:01 08/11/04 -0500, you wrote:
>Colleagues:
>few years back I read an article about an experiment in ceramic breakage
>
>(using flower pots, I believe). Can anyone help me with the reference -
>or any others on the same subject?  Thanx, in advance for any help.
>John