Light-colored Musining Formation overlying the red Jacobsville Formation in Pictured Rocks National Lakeshore
Type
Formation
Sub-units
Davis Formation
Franconia Formation
Ironton Sandstone
Galesville Sandstone
Eau Claire Formation
Michigan
Miner's Castle Member
Chapel Rock Member
Basal Conglomerate
Underlies
Au Train Formation
Overlies
Jacobsville Sandstone
Thickness
1,700 ft (520 m)
Lithology
Primary
Conglomerate
Other
Anhydrite
Location
Region
Michigan Ohio Ontario
Country
United States Canada
The Munising Group or Formation is a 1,700 feet (520 m) thick, white to light grey[1] Cambrian sedimentary unit that crops out in Michigan and (to a lesser extent) Ontario. At one end of its extent, it comprises a basal conglomerate overlain by the Chapel Rock Member and the Miners Castle Member; elsewhere, it comprises the Eau Claire, Galesville (=Dresbach), and Franconia Members. Anhydritic evaporite deposits are present in places.[2] The conglomerate was deposited by rivers in flood, with the Chapel Rock member, which contains deltaic deposits, representing transgression as the conglomerate cones became submerged; the Miners Castle member was deposited further from the shoreline, representing shelf deposits.[3] Its uppermost strata may be Early Ordovician in age, and contain conodonts, trilobites and phosphatic moulds of brachiopods, ostrocoderm fish and gastropods.[4]
The Munising lies unconformably above the Jacobsville Formation.[1]
^ ab"Pictured Rocks: Geologic Formations". US National Park Service. Retrieved August 5, 2011.
^Paul A. Catacosinos (1973). "Cambrian Lithostratigraphy of Michigan Basin". The American Association of Petroleum Geologists Bulletin. 57 (12): 2404–2418. doi:10.1306/83d9132b-16c7-11d7-8645000102c1865d.
^Charles a. Haddox, R. H. D. (1990). "Cambrian Shoreline Deposits in Northern Michigan". SEPM Journal of Sedimentary Research. doi:10.1306/212F9250-2B24-11D7-8648000102C1865D.
^Miller, J. F.; Ethington, R. L.; Rose, R. (2006). "Stratigraphic Implications of Lower Ordovician Conodonts from the Munising and Au Train Formations at Pictured Rocks National Lakeshore, Upper Peninsula of Michigan". PALAIOS. 21 (3): 227–237. doi:10.2110/palo.2004.p04-50.
The MunisingGroup or Formation is a 1,700 feet (520 m) thick, white to light grey Cambrian sedimentary unit that crops out in Michigan and (to a lesser...
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C D S O Є Bonneterre Formation MunisingGroup Davis Formation Franconia Formation Ironton Sandstone Galesville Sandstone Eau Claire Formation Potosi Dolomite...
C D S O Є Bonneterre Formation MunisingGroup Davis Formation Franconia Formation Ironton Sandstone Galesville Sandstone Eau Claire Formation Potosi Dolomite...
C D S O Є Bonneterre Formation MunisingGroup Davis Formation Franconia Formation Ironton Sandstone Galesville Sandstone Eau Claire Formation Potosi Dolomite...
C D S O Є Bonneterre Formation MunisingGroup Davis Formation Franconia Formation Ironton Sandstone Galesville Sandstone Eau Claire Formation Potosi Dolomite...
C D S O Є Bonneterre Formation MunisingGroup Davis Formation Franconia Formation Ironton Sandstone Galesville Sandstone Eau Claire Formation Potosi Dolomite...
C D S O Є Bonneterre Formation MunisingGroup Davis Formation Franconia Formation Ironton Sandstone Galesville Sandstone Eau Claire Formation Potosi Dolomite...
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C D S O Є Bonneterre Formation MunisingGroup Davis Formation Franconia Formation Ironton Sandstone Galesville Sandstone Eau Claire Formation Potosi Dolomite...
C D S O Є Bonneterre Formation MunisingGroup Davis Formation Franconia Formation Ironton Sandstone Galesville Sandstone Eau Claire Formation Potosi Dolomite...
C D S O Є Bonneterre Formation MunisingGroup Davis Formation Franconia Formation Ironton Sandstone Galesville Sandstone Eau Claire Formation Potosi Dolomite...
C D S O Є Bonneterre Formation MunisingGroup Davis Formation Franconia Formation Ironton Sandstone Galesville Sandstone Eau Claire Formation Potosi Dolomite...
C D S O Є Bonneterre Formation MunisingGroup Davis Formation Franconia Formation Ironton Sandstone Galesville Sandstone Eau Claire Formation Potosi Dolomite...
C D S O Є Bonneterre Formation MunisingGroup Davis Formation Franconia Formation Ironton Sandstone Galesville Sandstone Eau Claire Formation Potosi Dolomite...
C D S O Є Bonneterre Formation MunisingGroup Davis Formation Franconia Formation Ironton Sandstone Galesville Sandstone Eau Claire Formation Potosi Dolomite...
C D S O Є Bonneterre Formation MunisingGroup Davis Formation Franconia Formation Ironton Sandstone Galesville Sandstone Eau Claire Formation Potosi Dolomite...