Hemlock Formation  search
BTChronostratigraphic Units
 .Precambrian
 ..Proterozoic
 ...Paleoproterozoic
 ....Hemlock Formation
RTWisconsin
 Michigan
 Baraga Group
SNIn Baraga Group. Paleoproterozoic. N Michigan and N Wisconsin. Before 1989, was sometimes used for Hemlock Conglomerate in Alaska. Added to Thesaurus in 1989.