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Geologic units in Wayne county, Pennsylvania

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
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
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
Duncannon Member of Catskill Formation (Devonian) at surface, covers < 0.1 % 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

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