by R.R. Anderson

DfB=Defiance Basin,
DkB=Duncan Basin,
ShB=Shenandoah Basin,
AB=Ankeny Basin,
WB=Williamsburg Basin,
MB=Mineola Basin,
StB=Stratford Basin,
JB=Jewell Basin,
NBFZ=Northern Boundary Fault Zone,
PHFZ=Perry-Hampton Fault Zone,
TRSZ=Thurman-Redfield Structural Zone