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Marcellus Formation

Marcellus Formation
Marcellus shale exposure above Marcellus, N.Y. The vertical joints create sheer cliff faces.
Marcellus shale exposure above Marcellus, N.Y. The vertical joints create sheer cliff faces.
TypeGeological formation
AgeMiddle Devonian, ~390 Ma
PreЄ
Є
O
S
D
C
P
T
J
K
Pg
N
↓
Unit ofHamilton Group
Sub-unitsSee: Named members
UnderliesMahantango Formation
OverliesOnondaga Formation
Thicknessup to 900 feet (270 m)[1]
Lithology
PrimaryShale
OtherSlate, Limestone, Sandstone
Location
Named forMarcellus, New York
Named byJames Hall, 1839


RegionAppalachian Basin of
eastern North America
Extent600 miles (970 km)[2]

The Marcellus Formation, also classified as the Marcellus Subgroup of the Hamilton Group, Marcellus Member of the Romney Formation, or simply the Marcellus Shale, is a unit of marine sedimentary rock found in eastern North America. Named for a distinctive outcrop near the village of Marcellus, New York,[3] it extends throughout much of the Appalachian Basin.[4] The shale contains largely untapped natural gas reserves, and its proximity to the high-demand markets along the East Coast of the United States make it an attractive target for energy development.[5]

Stratigraphically, the Marcellus is the lowest unit of the Devonian age Hamilton Group, and is divided into several sub-units. Although black shale is the dominant lithology, it also contains lighter shales and interbedded limestone layers due to sea level variation during its deposition almost 400 million years ago.[6] The black shale was deposited in relatively deep water devoid of oxygen, and is only sparsely fossiliferous. Most fossils are contained in the limestone members, and the fossil record in these layers provides important paleontologal insights on faunal turnovers. The black shales also contain iron ore that was used in the early economic development of the region, and uranium and pyrite which are environmental hazards. The fissile shales are also easily eroded, presenting additional civil and environmental engineering challenges.

 

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