The Detroit River Group is a
geologic group
In geology, a group is a lithostratigraphic unit consisting of a series of related formations that have been classified together to form a group. Formations are the fundamental unit of stratigraphy. Groups may sometimes be combined into superg ...
in
Michigan
Michigan ( ) is a peninsular U.S. state, state in the Great Lakes region, Great Lakes region of the Upper Midwest, Upper Midwestern United States. It shares water and land boundaries with Minnesota to the northwest, Wisconsin to the west, ...
and
Ohio
Ohio ( ) is a U.S. state, state in the Midwestern United States, Midwestern region of the United States. It borders Lake Erie to the north, Pennsylvania to the east, West Virginia to the southeast, Kentucky to the southwest, Indiana to the ...
. It preserves
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 ...
dating back to the
Devonian
The Devonian ( ) is a period (geology), geologic period and system (stratigraphy), system of the Paleozoic era (geology), era during the Phanerozoic eon (geology), eon, spanning 60.3 million years from the end of the preceding Silurian per ...
period
Period may refer to:
Common uses
* Period (punctuation)
* Era, a length or span of time
*Menstruation, commonly referred to as a "period"
Arts, entertainment, and media
* Period (music), a concept in musical composition
* Periodic sentence (o ...
.
References
*
Further reading
* Brian R. Pratt, ''Lower Devonian Stromatoporoid reefs. Formosa Reef Limestone (Detroit River Group) of Southwestern Ontario.'' In: ''Reefs, Canada and Adjacent Area'', ed. by H.H.J. Geldsetzer, N.P. James and G.E. Tebbutt, Editors Canadian Society of Petroieum Geologists Memoir 13, 1989, p. 506-509
* Gilbert Klapper and, William A. Oliver, Jr., ''The Detroit River Group is Middle Devonian: Discussion on "Early Devonian age of the Detroit River Group, inferred from Arctic stromatoporoids".'' (Canadian Journal of Earth Sciences, 1995, 32(7): 1070–1073, https://doi.org/10.1139/e95-088
Geologic groups of Michigan
Geologic groups of Ohio
Devonian Michigan
Devonian Ohio
{{Michigan-geologic-formation-stub