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Middlesex Formation
Stratigraphic range: Frasnian
Type Formation
Unit of Sonyea Group
Underlies Cashaqua Shale or Pulteney shale
Overlies Genesee Group
Thickness6–75 feet (23 m)
Lithology
Primary Black Shale
Location
Region
CountryUnited States
Type section
Named forTown of Middlesex, NY

The Middlesex Formation is a carbon rich black shale geologic formation found in the Appalachian Basin. It represents one of several transgressive events (rising sea levels) during the Late Devonian. [1]

Description

The Middlesex is a laminated dark grey to black mudstones and siltstone. It developed in an Anoxic environment. Further evidence of this is the lack of bioturbation. There are also sparse sand and silt layers suggesting that they were single event deposits. [2]


References

  1. ^ KIRCHGASSER, WILLIAM T.; OVER, D. JEFFREY (9 December 2023). "FRASNIAN (UPPER DEVONIAN) STRATA OF THE GENESEE RIVER VALLEY, WESTERN NEW YORK STATE" (PDF). Otto's Website. Retrieved 9 December 2023.
  2. ^ Schieber, J. (1999-07-01). "Distribution and deposition of mudstone facies in the Upper Devonian Sonyea Group of New York". Journal of Sedimentary Research. 69 (4): 909–925. doi: 10.2110/jsr.69.909. ISSN  1527-1404.