Menominee Group; Composite unit of Siamo Slate and Ajibik Quartzite

Siamo Slate is laminated green siltstone and argillite. Ajibik Quartzite is white, buff, and pink orthoquartzite and less abundant sericite quartzite.
State Michigan
Name Menominee Group; Composite unit of Siamo Slate and Ajibik Quartzite
Geologic age Early Proterozoic
Lithologic constituents
Major
Metamorphic > Metasedimentary > Metaclastic > QuartziteSiamo Slate is laminated green siltstone and argillite. Ajibik Quartzite is white, buff, and pink orthoquartzite and less abundant sericite quartzite.
Minor
Metamorphic > Metasedimentary > Metaclastic > ArgilliteSiamo Slate is laminated green siltstone and argillite. Ajibik Quartzite is white, buff, and pink orthoquartzite and less abundant sericite quartzite.
Sedimentary > Clastic > SiltstoneSiamo Slate is laminated green siltstone and argillite. Ajibik Quartzite is white, buff, and pink orthoquartzite and less abundant sericite quartzite.
Metamorphic > Metasedimentary > Metaclastic > SlateSiamo Slate is laminated green siltstone and argillite. Ajibik Quartzite is white, buff, and pink orthoquartzite and less abundant sericite quartzite.
Comments Continental margin assemblage (north of Niagara Fault)
References
NGMDB product
Counties Marquette