The two that are not described individually are the bottom left and bottom center. They are:

 

Bottom Left:

Bare Island Point

tan quartzite, 3 inches long (tip broken off)

Late Archaic Period 2500 to 500 BC

Found May 18, 1991 in plowed field, Anne Arundel County, Maryland.

 

Bottom Center:

small (pistol size) flintlock gunflint (not really an Indian artifact)

amber chalcedony, 0.75 inches square

Colonial or Early American 1650 to 1850 AD

Found June 1, 1988 in plowed field, Bowie, Maryland (prior to construction of new exit ramp at junction of routes 50 and 3).