Llewellyn Formation

Llewellyn Formation
Stratigraphic range: Late Pennsylvanian
~308–300 Ma
A hand sample of the bottom of the Llewellyn from St. Clair, Pennsylvania
TypeSedimentary
Unit ofnone
Sub-unitsnone (most economic coal beds are named)
OverliesPottsville Formation
Thicknessup to 1,500 feet (460 m)[1]
Lithology
PrimarySandstone
OtherShale, Conglomerate, Coal
Location
RegionAppalachian Basin of
eastern North America
ExtentAnthracite fields of Pennsylvania
Type section
Named forLlewellyn, Pennsylvania
Named byG. 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]

  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.