submitted for dendrochronological analysis and then 
further analyzed by neutron autoradiography. This may 
show details of occupational chronology by _hyper- 
accumulation of trace elements in the tree through time. 
High levels suggest site occupation, low or diminishing 
levels unoccupied periods of time. 
9. Additional calculations can be made from dendrochrono- 
logical data (Tree Rings) and from the Trace Type of the 
contemporary canopy. 
TOTAL TEC, DEND. DATA 
[ Enrichment Ratio D 
TOTAL FEC. SOM. (Dendro) 
TOTAL T.E.C. CANOPY , : 
{ Enrichment Ratio C 
TOTAL T.E.C. SOIL (Canopy) 
This Enrichment Ratio is indicative of the flow rate of the 
cycling process between elemental uptake and elemental 
return. 
A comparison of modern enrichment processes Enrichment 
Ratio C compared to past ancient enrichment levels 
Enrichment Ratio D should bring greater understanding of 
the ecological conditions and of site occupations at 
particular locations. 
We introduce these measurements of Trace Element 
Concentration (T.E.C.), of TRACE TYPING and of the 
Enrichment Ratios to stimulate the building of a data base that 
draws on both ancient and modern materials and that promises 
to give rise to not only ethnobotanical identifications but to a 
greater and deeper understanding of plant utilization and 
transport with respect to archaeological sites. 
We look forward to examining the evidence for plant 
utilization on occupation sites, resulting in biogeochemical 
residues in the soil. If there are specific patterns of accumulation 
of elements in plant materials, then these patterns will be useful in 
interpretation. 
a 
