Hmmm... thinking about categories is thought-provoking. It would be nice if this article were to complement the rising definition of heritage by helping to further it, clarify it.
How about:
Ancient: Early Foundational (Dorking, OEG, WFBS, etc..)
Traditional: Late Foundational (La Fleche, Ancona, Crevecoeur, Hamburg, Minorca, Lakenvelder, Dominique, etc...)
Victorian Composites (through turn of century) (Plymouth Rock, Wyandotte, Orpington, etc...)
Early Industrial ( RIR, NH, Barnevelder. etc...)
Late Industrial (Delaware, Holland, etc...)