Dear Scholar Steen,
 
These references deal with eighteenth century French-Colonial
structures within the Central Mississippi River Valley portion of the
Illinois Country -
 
1. BUILDING A HOUSE IN 18TH CENTURY STE. GENEVIEVE, by Melborn D.
Thurman. Pendragon's Press, 1984. This is an architectural study of a
standing post-in-the-ground structure.
 
2. FRENCH COLONIAL ARCHAEOLOGY - THE ILLINOIS COUNTRY AND THE WESTERN
GREAT LAKES, John A. Walthall, ed. University of Illinois Press,
Urbana, 1991. Chapter 11 (pp. 165-189) deals with the excavation of a
circa 1780-1800 post-in-the-ground structure from a site near the
Illinois Country village of Kaskaskia.
 
You need to take a look at both of these.
 
 
                                          F. Terry Norris