The Saginaw Group is a

geologic group Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Eart ...

in Michigan composed of sedimentary rock deposited during the

Pennsylvanian Period The Pennsylvanian ( , also known as Upper Carboniferous or Late Carboniferous) is, in the International Commission on Stratigraphy, ICS geologic timescale, the younger of two period (geology), subperiods (or upper of two system (stratigraphy), s ...

(circa 323.2 million years ago to 298.9 million years ago. Saginaw group rocks include sandstone, shale, coal, and limestone of fresh water, brackish, and marine origin.

Fossils A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved in ...

dating back to the Penssylvanian Period ( Late or Upper Carboniferous period) can be found in Saginaw Group formations.

References

* USGS Mineral Resources On-Line Spatial Data. https://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=MIPAs. Retrieved 2 May 2017. * Geologic groups of Michigan {{Michigan-geologic-formation-stub

See also

References