Conversation so far:
where did the name des moines come from
Des Moines, Iowa, takes its name from Fort Des Moines, which was named for the Des Moines River.
what does des moines mean
Des Moines translates literally to either from the monks or of the monks.
how long have people lived in the area of des moines, iowa
Based on archeological evidence, the junction of the Des Moines and Raccoon Rivers has attracted humans for at least 7,000 years.
are there any archaelogical sites in des moines, iowa
The Palace Site is a circa 7,000-year-old archeological site in Des Moines, Iowa.

Question: what has been found at the site
Self-contained rewrite: what has been found at the palace site