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Geologic units in Wayne county, Pennsylvania

Upper Walton Formation (Upper Devonian) at surface, covers < 0.1 % of this area
Upper Walton Formation - shale, sandstone, conglomerate.
Lithology: shale; sandstone; conglomerate
Slide Mountain Formation (Upper Devonian) at surface, covers 0.1 % of this area
Slide Mountain Formation - sandstone, shale, conglomerate.
Lithology: sandstone; shale; conglomerate
Catskill Formation (Devonian) at surface, covers 62 % of this area
Catskill Formation - Grayish-red sandstone, siltstone, shale, and mudstone; locally conglomeratic; contains gray sandstone in upper part; lithologies arranged in fining-upward cycles; equivalent to the Hampshire Formation south of Pennsylvania.
Lithology: sandstone; siltstone; shale; mudstone; conglomerate
Duncannon Member of Catskill Formation (Devonian) at surface, covers 3 % of this area
Duncannon Member of Catskill Formation - Grayish-red sandstone, siltstone, and mudstone in fining-upward cycles; conglomerate occurs at base of some cycles.
Lithology: sandstone; siltstone; mudstone; conglomerate
Poplar Gap Member of Catskill Formation (Devonian) at surface, covers 0.6 % of this area
Poplar Gap Member of Catskill Formation - Gray and light-olive-gray sandstone, conglomerate, and siltstone containing intermittent red beds; laterally equivalent to Clarks Ferry, Sawmill Run, and Berry Run Members.
Lithology: sandstone; conglomerate; siltstone
Poplar Gap and Packerton Members of Catskill Formation, undivided (Devonian) at surface, covers 20 % of this area
Poplar Gap and Packerton Members of Catskill Formation, undivided - Includes, in descending order, the Poplar Gap (Dcpg) and Packerton (Dcp) Members of the Catskill Formation.
Lithology: sandstone; conglomerate; siltstone
Pottsville Formation (Pennsylvanian) at surface, covers 0.8 % of this area
Pottsville Formation - Predominantly gray sandstone and conglomerate; also contains thin beds of shale, claystone, limestone, and coal; includes Olean and Sharon conglomerates of northwestern Pennsylvania; thin marine limestones present in Beaver, Lawrence, and Mercer Counties; minable coals and commercially valuable high-alumina clays present locally.
Lithology: sandstone; conglomerate; shale; siltstone; claystone; limestone; coal
Llewellyn Formation (Pennsylvanian) at surface, covers < 0.1 % of this area
Llewellyn Formation - Gray, fine- to coarse-grained sandstone, siltstone, shale, conglomerate, and numerous anthracite coals in repetitive sequences.
Lithology: sandstone; siltstone; shale; conglomerate; coal
Honesdale Formation (Upper Devonian) at surface, covers < 0.1 % of this area
Honesdale Formation - sandstone, shale.
Lithology: sandstone; shale
Long Run and Walcksville Members of Catskill Formation, undivided (Devonian) at surface, covers 14 % of this area
Long Run and Walcksville Members of Catskill Formation, undivided - Includes, in descending order, the Long Run (Dclr) and Walcksville (Dcw) Members of the Catskill Formation, which are described separately below.
Lithology: sandstone; siltstone; mudstone

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