Llewellyn Formation

Llewellyn Formation
Llewellyn Formation
Stratigraphic range: Late Pennsylvanian; ~308–300 Ma PreꞒ Ꞓ O S D C P T J K Pg N
	A hand sample of the bottom of the Llewellyn from St. Clair, Pennsylvania
Type	Sedimentary
Unit of	none
Sub-units	none (most economic coal beds are named)
Overlies	Pottsville Formation
Thickness	up to 1,500 feet (460 m)
Lithology
Primary	Sandstone
Other	Shale, Conglomerate, Coal
Location
Region	Appalachian Basin of; eastern North America
Extent	Anthracite fields of Pennsylvania
Type section
Named for	Llewellyn, Pennsylvania
Named by	G. Wood, 1964

The Llewellyn Formation is a mapped bedrock unit in eastern Pennsylvania. It was previously known as the "coal measures" and the post-Pottsville rocks. The formation is named for the community of Llewellyn in Schuylkill County.^[1]

^ ^a ^b Wood, G.H., Trexler, J.P., Kehn, T.M., (1964). Geology of the West-Central Part of the Southern Anthracite Field and Adjoining Areas, Pennsylvania. United States Geological Survey, C-46.

[multipile-1] Wood, G.H., Trexler, J.P., Kehn, T.M., (1964). Geology of the West-Central Part of the Southern Anthracite Field and Adjoining Areas, Pennsylvania. United States Geological Survey, C-46.

[1]

Llewellyn Formation
Stratigraphic range: Late Pennsylvanian ~308–300 Ma PreꞒ Ꞓ O S D C P T J K Pg N
A hand sample of the bottom of the Llewellyn from St. Clair, Pennsylvania
Type	Sedimentary
Unit of	none
Sub-units	none (most economic coal beds are named)
Overlies	Pottsville Formation
Thickness	up to 1,500 feet (460 m)^[1]
Lithology
Primary	Sandstone
Other	Shale, Conglomerate, Coal
Location
Region	Appalachian Basin of eastern North America
Extent	Anthracite fields of Pennsylvania
Type section
Named for	Llewellyn, Pennsylvania
Named by	G. Wood, 1964

Llewellyn Formation

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