Freda Sandstone  search
BTChronostratigraphic Units
 .Precambrian
 ..Proterozoic
 ...Mesoproterozoic
 ....Freda Sandstone
RTWisconsin
 Michigan
 Oronto Group
SNN Michigan and N Wisconsin. In Oronto Group. Overlies Nonesuch Shale; underlies Orienta Sandstone. Added to Thesaurus in 1989.