Black River Group
Stratigraphic range: Middle Ordovician to Late Ordovician
Whiterockian-Mohawkian
~
Mudcracked limestone (Tyrone Limestone, Black River Group, Late Ordovician; Frankfort, Kentucky)
TypeGroup
Sub-unitsCoboconk Formation
Deicke and Millbrig bentonite layers
Gull River Formation
Hatter Formation (PA)
Isle La Motte Limestone (NY,VT)
Linden Hall Limestone (PA)
Pamelia Formation (NY)
Pecatonica Formation (IN)
Peery Limestone (VA,WV)
Plattin Formation (IN)
Selby Limestone (NY)
Snyder Limestone (PA,VA,WV)
Ward Cove Limestone (VA,WV)
Wardell Formation (VA, WV)
Witten Limestone (VA,WV)
Shadow Lake Formation.
New York
Amsterdam Limestone
Waterton Limestone
Lowville Formation
UnderliesLexington Limestone and Trenton Group
OverliesSt. Paul Group and Wells Creek Formation
Lithology
PrimaryLimestone
OtherDolomite, Mudstone
Location
Region Indiana
 Kentucky
 Michigan
 New York
 Ohio
 Pennsylvania
 Tennessee
 West Virginia

 Ontario
 Quebec
Country United States
 Canada

The Black River Group is a geologic group that covers three sedimentary basins in the Eastern and Midwestern United States. These include the Appalachian Basin, Illinois Basin and the Michigan Basin. It dates back to the Late Ordovician period. It is roughly equivalent to the Platteville Group in Illinois.[1] In Kentucky and Tennessee it is also known as the High Bridge Group. In areas where this Geologic Unit thins it is also called the Black River Formation (undifferentiated). One example of this is over the Cincinnati Arch & Findley Arch.[2] Large parts of the Black River have been dolomized (where the parent limestone CaCO3 has been turned into dolomite CaMg(CO3)2.) This happed when there was interaction of hot saline brine and the limestone. This created hydrothermal dolomites that in some areas serve as petroleum reservoirs.[3]

Description

The Black River Group is characterized by carbonates, primarily limestone. Some dolostones can be found in localized areas.[4] Due to fracturing and porosity naturally occurring with in the formation it servers as a gas reservoir throughout its reach.[5] It also serves as an oil reservoir in Michigan and North West Ohio.[5][6]

Stratigraphy

The Black River Group is predominantly composed of carbonates. In addition clay minerals maybe found in differing amounts. Locally sand and silt maybe found in thin horizons especially in the eastern reaches of the unit. In addition there are K-Bentonite beds. These were formed as a result of volcanic eruptions depositing layers of volcanic ash[7] The Black River Group was deposited during a time when large parts of North America were a passive cratonic margin. North America at the time was near the equator and was a tropical environment. Large parts of what is now North America were covered by the Iapetus Ocean. The Black River Group was formed during a time of transition time where Laurentia was subject to the beginnings of the Taconic Orogeny. During the Cambrian the Iapetus began to slowly close. As Laurentia moved towards an Island Arch that it would eventually collide with the crust folded downward. As this happened the carbonate deposition of the continental shelf gradually gave way to clastic deposits of a deep marine environment.[4][8] As a result, there are more siliceous deposits to the east. The Taconic Orogeny occurred to the east and this formed a basin but further west the crust buckled up into an arch. The result was the Cincinnati Arch. This arch was eroded back to late Ordovician aged rock. This split the basin that the Iapetus Ocean into three separate basins.[9]

Subunits

New York State

Amsterdam Limestone

The Amsterdam Limestone is a geologic formation in New York. It dates back to the Ordovician period. It is a unit of the Black River Group in Eastern New York.

Fossils

Cartersoceras noveboracense

Waterton Limestone

The Waterton Limestone is a geologic formation in New York. It dates back to the Ordovician period. It is a unit of the Black River Group in Eastern New York.

Lowville Formation

The Lowville Formation is a geologic formation in New York and Ontario. It preserves fossils dating back to the Ordovician period.

Energy production

The Black River Group acts as a reservoir for natural gas and petroleum. The reservoirs are associated with dolostones and. Gas and oil fields can be found in New York, Pennsylvania, Ohio, Indiana, Kentucky, Michigan, and Tennessee.[3][10]

References

  1. ↑ "Black River Group". igws.indiana.edu. Retrieved 2023-09-14.
  2. ↑ "NGMDB Product Description Page". ngmdb.usgs.gov. Retrieved 2023-09-17.
  3. 1 2 "A Geologic Play Book for Trenton-Black River Appalachian Basin Exploration" (PDF). West Virginia Geological Survey.
  4. 1 2 SELLECK, BRUCE W. SELLECK. "BLACK RIVER AND TRENTON GROUPS, NORTHWESTERN NEW YORK STATE". Researchgate.
  5. 1 2 Patchen, Douglas G.; Hickman, John B.; Harris, David; Drahovzal, James A (June 2006). "A Geologic Play Book for Trenton-Black River Appalachian Basin Exploration". Researchgate.
  6. ↑ Colquhoun, Ian; Vansickel, Bill. "TRENTON- BLACK RIVER HTD RESERVOIRS OF THE MICHIGAN BASIN" (PDF). Oil, Gas and Salt Resources Library.
  7. ↑ Stith, David A. Stith (1979). "CHEMICAL COMPOSITIPN, STRATIGRAPHY, AND DEPOSITIONAL ENVIRONMENTS OF THE BLACK RIVER GROUP (MIDDLE ORDOVICIAN), SOUTHWESTERN OHIO" (PDF). Ohio Department of Natural Resources.
  8. ↑ "NYC Regional Geology". 2011-07-22. Archived from the original on 2011-07-22. Retrieved 2023-09-19.
  9. ↑ Prater, Jessica (2022-10-07). "The Cincinnati Arch". Cincinnati Museum Center. Retrieved 2023-09-25.
  10. ↑ "UNDERGROUND STORAGE OF NATURAL GAS IN INDIANA" (PDF). Scholar Works Indiana University.
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