Here is a reference.  If you need a copy of the paper, I can FAX it to you:
 
Wegars, Priscilla and Caroline D. Carley
1982     The Very Latest Rage : Design Trends in Twentieth Century Ceramics.
Paper presented at the 15th annual meeting of the Society for Historical
Archaeology, Philadelphia.
 
The thing that I find troubling about your basic proposition is that anyone
would rely on unmarked whitewares to temporally analyze an early twentieth
century assemblage.  The rest of the assemblage, including the presumably
maker-marked ceramics, should be pretty obvious, precluding worrying about
attributes such as paste and glaze.  Sounds like the pearlware/whiteware
nonsense all over again.
 
Mark C. Branstner
Great Lakes Research Associates, Inc.