Franconia Formation

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Geologic formation in the upper mid-western United States

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Franconia Formation

Stratigraphic range: Cambrian
Type| Formation
Unit of| Munising Group (IN,MI, WI), Knox Group (IL), Tunnel City Group (IA,MN,WI)
Sub-units| Birkmose Member (MO), Davis Member (IL), Derby-Doe Run Member (IL), Ironton Member (IL,WI,MI), Mazomanie Member (WI), Reno Member (MO,MN,WI), Tomah Member (MO)
Underlies| Potosi Dolomite and St. Lawrence Formation
Overlies| Ironton Sandstone
Location
Region| Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Ohio, and Wisconsin
Country| United States

The Franconia Formation is a geologic formation in the upper mid-western United States, with outcroppings found in Illinois, Indiana, Iowa, Michigan, Minnesota, Missouri, Ohio, and Wisconsin.[1] It preserves fossils dating back to the Cambrian period. It was named the Franconia Formation due to the first published documentation of exposures in vicinity of Franconia, Minnesota[1] in the 1897 Ph.D. dissertation by Charles P. Berkley at the University of Minnesota titled Geology of the St. Croix Dalles.[2] The Franconian stratigraphic stage was named after this formation.

The formation consists of fine-grained dolomitic sandstone with interbedded shaly zones, becoming more dolomitic towards the east and south of its extent.[3]

## See also

[edit]

* Paleontology portal

* List of fossiliferous stratigraphic units in Wisconsin
* Paleontology in Wisconsin

## References

[edit]

1. ^ a b "Geolex — Franconia". ngmdb.usgs.gov. Retrieved 2021-08-13.
2. ^ Berkey, Charles P. (1897). "Geology of the St. Croix Dalles". hdl:11299/177986. `{{cite journal}}`: Cite journal requires `|journal=` (help)
3. ^ "Franconia Formation". igws.indiana.edu. Retrieved 2021-08-13.

## External links

[edit]

* Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
* USGS National Geologic Map Database Unit Summary for "Franconia"
* Indiana Geological and Water Survey: Franconia Information at the University of Indiana

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Chronostratigraphy of Illinois

Ph|

| Cz|

| Q|

| Holocene|

* Glacial alluvium, drift, and loess

|

Pleistocene|

Embayment Megagroup

* Mounds Gravel
* Grover Gravel

| Pliocene|

Embayment Megagroup

* Mounds Gravel
* Grover Gravel

|

Pe|

| Eocene|

Embayment Megagroup

* Wilcox Formation
* Claiborne Formation

|

Paleocene|

Embayment Megagroup

* Porters Creek Formation
* Clayton Formation

Mz|

| K|

| Upper|

| Maastrichtian|

Embayment Megagroup

* Owl Creek Formation
* McNairy Formation
* Baylis Formation

|

Campanian|

Embayment Megagroup

* Post Creek Formation
* Baylis Formation

Pz|

| C|

| ⁋|

| Kasimovian|

McLeansboro Group

* Bond Formation
* Mattoon Formation
* Patoka Formation
* Shelburn Formation

|

Moscovian|

* Carbondale Group

Bashkirian|

Raccoon Creek Group

* Brazil Formation
* Caseyville Formation
* Mansfield Formation
* Tradewater Formation
* Staunton Formation

| Serpukhovian|

Pope Mega Group

*     Grove Church
Kinkaid Limestone
Dagonia Sandstone
Clore Formation
Palestine Sandstone
Menard Limestone
Waltersburg Formation
Vianna Formation
Tar Springs Sandstone

|

Viséan|

Pope Mega Group

*     Glen Dean Limestone
Hardinsburg Sandstone
Haney Limestone
Fraileys Formation
Beech Creek Limestone
Cypress Sandstone
Ridenhower Formation
Bethel Sandstone
Downeys Bluff Limestone
Yankeetown Limestone
Renault Limestone
Aux Vases Sandstone
Ste. Genevieve Limestone

* Golconda Formation
* Paint Creek Formation
* Paoli Formation

Tournaisian|

* Borden Siltstone
* Chouteau Limestone
* Fern Glen Formation
* Meppen Limestone
* New Albany Formation
* Springville Shale

* Borden Siltstone
* Burlington Limestone
* Fort Payne Formation
* Keokuk Limestone
* Salem Limestone
* St. Louis Limestone
* Ullin Limestone
* Warsaw Formation

| Upper|

| Famennian|

* New Albany Shale

|

Frasnian|

* New Albany Shale

Middle|

| Givetian|

* Cedar Valley Limestone
* St. Laurent Formation

|

Eifelian|

* Grand Tower Limestone
* Wapsinicon Limestone
* Detroit River Formation

Muscatatuck Group

*     North Vernon Limestone
Jeffersonville Limestone

Lower|

| Emsian|

New Harmony Group

*     Clear Creek Chert
Clear Creek Formation

|

Pragian|

New Harmony Group

*     Backbone Limestone

Hunton Megagroup

*     Backbone Limestone
Grassy Knob Chert
Bailey Limestone

| Ludlow|

| Ludfordian|

Hunton Megagroup

* Moccasin Springs Formation
* Racine Dolomite

|

Gorstian|

Hunton Megagroup

* Moccasin Springs Formation
* Racine Dolomite

Wenlock|

| Homerian|

* Sugar Run Dolomite

|

Sheinwoodian|

Hunton Megagroup

* Joliet Dolomite
* St. Clair Limestone

* Marcus Dolomite

Llandovery|

| Telychian|

Hunton Megagroup

* Sexton Creek Limestone

* Marcus Dolomite

|

Aeronian|

Hunton Megagroup

* Sexton Creek Limestone

Rhuddanian|

* Bowling Green Dolomite
* Brainard Shale
* Fort Atkinson Limestone
* Neda Formation

* Blanding Dolomite

Hunton Megagroup

* Kankakee Dolomite

* Mosalem Formation
* Sweeney Dolomite
* Tete des Morts Dolomite

| Upper|

| Hirnantian|

* Leemon Formation

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Sandbian|

* St. Peter Sandstone

* Cape Limestone
* Decorah Formation
* Dubuque Formation
* Dunleith Formation
* Glenwood Formation
* Grand Detour Formation
* Joachim Dolomite
* Kimmswick Limestone
* Maquoketa Formation
* Mifflin Formation
* Nachusa Formation
* Quimbys Mill Formation
* Scales Shale
* Wise Lake Formation

Middle|

| Darriwilian|

* Dutchtown Limestone
* St. Peter Sandstone

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* Everton Formation
* Pecatonica Formation
* Plattin Limestone

Lower|

| Tremadocian|

* New Richmond Sandstone
* Oneota Dolomite
* Shakopee Dolomite

|

* Bonneterre Formation

Munising Group

* Davis Formation
* Franconia Formation
* Ironton Sandstone
* Galesville Sandstone
* Eau Claire Formation

* Potosi Dolomite
* Derby-Doerun Formation
* Eminence Dolomite
* Jordan Sandstone
* Mt. Simon Sandstone

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Chronostratigraphy of Indiana

Ph|

| Pz|

| C|

| ⁋|

| Kasimovian|

McLeansboro Group
Bond Formation, Mattoon Formation, Patoka Formation

|

Moscovian|

McLeansboro Group
Shelburn Formation

Carbondale Group
Dugger Formation, Petersburg Formation, Linton Formation
Raccoon Creek Group
Staunton Formation

Bashkirian|

Raccoon Creek Group
Brazil Formation, Mansfield Formation

| Tournaisian|

* New Albany Shale

|

* Beaver Bend Limestone
* Beech Creek Limestone
* Bethel Formation
* Big Clifty Formation
* Branchville Formation
* Clore Formation
* Coldwater Shale
* Cypress Formation
* Degonia Formation
* Edwardsville Formation
* Elwren Formation
* Glen Dean Limestone
* Grove Church Shale
* Haney Limestone
* Hardinsburg Formation
* Harrodsburg Limestone
* Kinkaid Limestone
* Menard Limestone
* Muldraugh Formation
* New Providence Shale
* Palestine Formation
* Paoli Formation
* Ramp Creek Formation
* Reelsville Limestone
* Rockford Limestone
* Salem Limestone
* Sample Formation
* Spickert Knob Formation
* St. Louis Limestone
* St. Genevieve Limestone
* Sunbury Formation
* Tar Springs Formation
* Tobinsport Formation
* Vienna Limestone
* Waltersburg Formation

| Upper|

| Famennian|

* New Albany Shale

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* Antrim Shale
* Backbone Limestone
* Clear Creek Chert
* Detroit River Formation
* Ellsworth Shale
* Grassy Knob Chert
* Jeffersonville Limestone
* North Vernon Limestone
* Traverse Formation

* Bailey Limestone
* Brassfield Limestone
* Cataract Formation
* Louisville Limestone
* Moccasin Springs Formation
* Pleasant Mills Formation
* Salamonie Dolomite
* Sexton Creek Limestone
* St. Clair Limestone
* Wabash Formation
* Waldron Shale

* Brainard Shale
* Dillsboro Formation
* Dutchtown Formation
* Everton Dolomite
* Fort Atkinson Limestone
* Joachim Formation
* Kope Formation
* Lexington Limestone
* Oneota Dolomite
* Pecatonica Formation
* Plattin Formation
* Scales Shale
* Shakopee Dolomite
* St. Peter Sandstone
* Trenton Limestone
* Whitewater Formation

* Davis Formation
* Eau Claire Formation
* Franconia Formation
* Galesville Sandstone
* Ironton Sandstone
* Mt. Simon Sandstone
* Potosi Dolomite

pЄ|

* Middle Run Formation

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